This sounds like a bullshyt excuse, they're claiming that the limitations of the series s prevents them from offering 60fps due to the multiplayer functions, but it's possible to have people playing multiplayer with different fps.
There's people playing cross play multiplayer on PCs with 120fps against consoles with 60fps.
The fortnite on switch runs at 30fps and can crossplay with consoles running 60fps.
I don't understand the logic.
And yet the game will run a 30 fps on a weak pc and 60+ on a powerful one, why can't it be the same for consoles? sounds to me like they didn't left time to optimize the game so locked it at 30 and blamed MS.