Not really? Who has been worth their money then?
ROR: $7.5M AAV makes him the 19th highest paid center in the NHL. In his 2 years with the Blues he has won a Conn Smythe, a Selke, has another Selke nomination, 138 points in 153 regular season games, 34 points in 35 playoff games and is unquestionably an average or above average 1C. He is 17th in center scoring during his time as a Blue, so even if you ignore hie elite level defensive play he has produced slightly better than the price of his contract relative to his peers.
Perron: $4M AAV makes him the 146th highest paid NHL forward. He is 71st in forward scoring under that contract, despite missing 25 games due to injury during that 2 year time frame. 25 points in 35 playoff games and he is 27th among forwards in game winning goals in that stretch so let's not act like he is somehow just a low calorie scorer. He is also a low-key pest and might be the best net front presence on the team.
Parayko: $5.5M AAV makes him the 41st highest paid D man in the NHL. The other D making $5.5M are Petry, Goligoski, Stralman and Leddy. Are you really saying that Parayko doesn't belong at or above that group? Parayko is 14th among NHL D men in even strength TOI per game since signing his contract and was top 10 in that stat each of the last 2 years. He led a Cup winner in even strength TOI per game in the playoffs and is included in basically every top 20 NHL D men list written in the last 18 months. Even though his strength is defense, he is 44th in even strength scoring among NHL D men since signing his deal and 47th in scoring overall among NHL D men. His offensive production alone would make him almost worth the contract even if you ignore his fantastic defensive and transition play over the last 3 years.
All 3 of these guys are huge bargains relative to their contract. They were all major contributors to a Cup and even ignoring that have significantly outperformed their contracts. Acting like these 3 haven't even lived up to their contract is a laughably bad opinion and demonstrates a fundamental lack of knowledge about NHL contracts.
Additionally, Schwartz hasn't been quite as big of a bargain, but he has absolutely lived up to his contract. 207 points in 280 games under his contract, which is a consistent 60 point pace. That puts him 71st in forward scoring over those 4 years, despite missing about 40 games due to injury. At $5.35M AAV, he is outside the top 100 highest paid forwards. He also has 33 points in 46 playoff games under this contract. Again, he's not the bargain that the above 3 are, but he has absolutely lived up to his contract.
Injuries mean that Tarasenko probably won't be worth his $7.5M AAV moving forward. However, he has absolutely been worth his contract to date. Despite missing over a season worth of time due to injury, Tarasenko is 16th in goals over the duration of his contract. He's 11th in goals per game over that stretch (minimum 100 games played since 2015). 7 of the 10 people ahead of him on that list make $8.5M or more. Pastrnak, Laine and Marchand are the other 3 guys. They all make between $6-$7M. Laine is on a 2 year bridge deal signed after a down year with no arbitration rights and the other 2 signed their contracts before they blossomed as goal scorers. Again, Tarasenko hasn't been a bargain and injuries will likely derail his performance. But he has without question lived up to his contract.
Schenn has been a bargain on his contract, but it remains to be seen whether he will live up to the contract that goes into effect next season. Schenn had 182 points in his 225 games with the Blues making $5.125M. That is 27th among NHL centers in that stretch. His new contract makes him the 28th highest paid center in the league next year. So even judging his past performance against his new cap hit and not the money he was actually making, he would be worth it.
"Only Petro has lived up to his contract" is an atrociously bad take. There is an argument to be made that the Blues have gotten better value for their top paid players than any team in the league over the last 3 years. I would be stunned if you could find 5 NHL teams who have a greater percentage of players that lived up to their contracts. We can debate whether Army's decisions since the Cup win have been good or bad. We can argue about overpayments to Faulk and Schenn and we can argue about the term we gave out. But there is no debate about whether Blues players have lived up to their contracts so far. They overwhelmingly have.