Deny the obvious all you want, but it is an indisputable fact that many more gamers who pay attention, as well as the games media itself, as well as a massive number of content creators and streamers all over the web, are paying far more attention to every move Bethesda makes since the acquisition by Microsoft, which can, and does, filter on down to the larger gaming audience.
Sony's timed exclusive deal is one element of what drew attention to Bethesda, but once Microsoft went so far as to purchase Zenimax, Bethesda and all their assets including game studios, the focus on Bethesda kicked into overdrive. You ever wonder why there is a new thread every few weeks on whether their games will be exclusive or not? Would any of that be taking place if not for Microsoft buying Bethesda? The answer is no.
What you seem out to achieve in light of reviews that clearly caught you and many others off guard, but not people like me who could see how good and special this game was looking from the get go, is to downplay the fact that Arkane, now an Xbox First Party studio, has knocked it out of the park with this game, they clearly have a major critical success on their hands, and this doesn't just do great things for Sony and PS5 this year, but it also greatly benefits Microsoft who owns the developer as well as the Deathloop IP going forward. I've said this from the jump, but maybe people just never believed it or fully comprehended what was meant. The success of each of these PS5 timed exclusive Bethesda games, Deathloop and Ghostwire: Tokyo, be it commercial, critical, or both, is the best case scenario for Microsoft who wants to see the quality of their acquisition reinforced. Of the two Bethesda games Sony has timed, I had high hopes for this, but I was much more excited for Ghostwire: Tokyo. To think that Deathloop could truly be THIS good, as good as what these reviews seem to be suggesting, as amazing as what the previews and interviews suggested it could be, is the best possible outcome as far as Microsoft and Bethesda are concerned.
And just to add, the same argument you're using now to claim nobody knows or cares who is making these games is the total opposite of what individuals exactly like you use when you argue the fact that it's because it's Insomniac who is making Wolverine for PS5 that further adds to the hype and excitement for what that game can be. Try to be consistent because it stands out when you're not. While many may not know who is making any of these games, there are more than enough who almost certainly do, plenty more who will learn, and Arkane and every other developer under the Xbox banner after the Microsoft acquisition, has only received increased attention from gamers since the Microsoft acquisition.
Why exactly were games like Dishonored and Prey and Wolfenstein thrust back into the spotlight during this year? Because Microsoft acquired Bethesda and that led to all their games being dropped onto Xbox Game Pass for console, PC and cloud for all gamers to try. They then also heavily featured them with fps boost enhancements, which led to videos like this from Digital Foundry.
To claim that exclusive deals or acquisitions don't raise the visibility and number of eyes who are paying attention to what a studio does is disingenuous at best. All that said, I'm extremely happy for Arkane, Bethesda and Microsoft. I love seeing things go well like this, even as a timed PS5 exclusive.