Manfred is willing to eat half the regular season so he can get his expanded 14-team playoffs, as the playoffs provide sell-outs in gate revenue, massive broadcast contracts with Fox and TBS, and tons of ad revenue for the commercials they sell during that time.
And oh yeah, PLAYERS ARE NOT PAID SALARY FOR POSTSEASON GAMES. They get playoff shares which are distributed arbitrarily by teams. The playoff share pool last year was $90 million which sounds huge, but doing the math on it - ten teams, 25-man rosters, divide the 90m by 250 and you're at $360K per. Now the teams that go farther get more and the WC teams eliminated get less, but let's keep that average for sake of argument. If you get to the World series, say you play 4 games in the LDS, 6 in the LCS, 6 in the WS to total 16 games of high pressure postseason work. 360k/16 is 22.5K. Again, seems like a good amount of money but prorate that total to 162 and it's the equivalent of a $3.64 million salary for the whole year, which is below the average MLB salary of $4.17m (which has fallen over the last 3 years despite Harper/Tatis/Scherzer megacontracts). And that's just using averages, if you're the Yankees and lost in the WC game you probably got $500 and a bag of peanuts (though Gerrit Cole didn't even earn those peanuts). So in sum, Manfred's only negotiating point in the entire dispute is to try to maximize the revenue and profit turned by MLB owners while compelling the players to perform additional work for lesser monetary compensation.
He's just a total slimeball.