That's not true. From NaturalStatTrick:
ES P/60, 2017-2019
Matthews: 2.95
Stamkos: 2.82
Kane: 2.79
Eichel: 2.55
Domi: 2.47
Domi is in last. And then we can't forget the other part of production:
PP P/60, 2017-2019
Stamkos: 7.75
Matthews: 6.43
Kane: 5.38
Eichel: 5.30
Domi: 2.82
Domi is far in last. Using P/60, we would conclude that Domi is not on the level of these other players. In fact, even in the smaller sample, we would conclude that when we consider both ES and PP, instead of just specifically 5v5.
That's also not true.
Player Season Totals - Natural Stat Trick
That's also not true... From NaturalStatTrick:
ES P/60, 2017-2020
Eichel: 2.50
Guentzel: 2.47
Backstrom: 2.32
Domi: 2.29
Kessel: 2.06
The only one he outperformed at ES over the past 3 years was Kessel, and that's because Kessel completely fell off a cliff offensively at ES this year (with a 1.29 ES P/60). He's been staying afloat with that other part of production you keep forgetting, the PP:
PP P/60, 2017-2020
Kessel: 7.16
Eichel: 5.59
Backstrom: 5.10
Guentzel: 4.45
Domi: 3.16
Domi is far in last. Using P/60, we would once again conclude that Domi is not on the level of these other players.
The Matthews/McDavid stats I posted are their career stats at time of signing their post-ELC contract. That is a 2 year sample for McDavid, and a 2 and a half year sample for Matthews.