No the only difference is not “scale”
Stellar Blade looks better everytime we see it, and it may have not gotten its budget and extended dev time without Sony
Call of Duty is getting made at the same quality with no risk to profitability or studio life support whether MS buys ATVI or not
The only point he makes, and I believe it is a reasonable one, is that Sony, in the case of Steller Blade, has purchased the IP, and as a result, it will no longer be available to Xbox customers. So unless he is misrepresenting and presenting a timed exclusivity as that, he has a point there, but as far as I know, most studios that Sony acquired were either working with Sony as a second-party or did not own IP of their own before being bought by Sony. If that is the only example he has, Sony has not completely removed games from other systems, as MS will now have done after both Bethesda and Activision. (Both engage in timed exclusivity so faulting one over the other for it is silly)
But for me, it is a stupid argument anyway. Like it or not, MS is in the situation that it is in, not Sony. Saying Sony has done similar things at a smaller scale has no bearing on how this deal will be looked at, well maybe, kind of. Hell, he's acknowledging that Sony does it at a smaller scale, which showcases how MS is using their muscle to carve out a space here, making his entire point a bit silly when you have to highlight how one is doing it at a smaller scale vs the other lol.
EDIT
I think someone else made this point better than I will... but if you have no issues with MS doing what they are. Just acknowledge it straight up. No need to hide behind your words. They are either making cut-throat moves or they are doing it for the benefit of all gamers. It's not both. Arguing that expanding their ecosystem (PC, Xbox, Cloud) allows more gamers to play while removing content from one system is somehow better for everyone is stupid and deceptive! Sure, on paper that might be true but it is still being taken away from a specific group of customers. Also, just because you have more channels for people to engage with you does not mean that ALL of them are already on those channels, so that entire argument, in my opinion, is made in bad faith.