JC, does this video, https://www.youtube.com/watch?v=yhniqRQqafQ @ around the 3:20 mark to the end of video, need HB to even patch this game to run at higher resolution and FPS? If I'm reading this video correctly, it seems that Microsoft has built in the ability on both the Series X/S to boost performance on XB1 titles to run more optimally. Let me know your thoughts.
What a fantastic video you've linked there! Starting at the 3:20 point, they're reading a lot, word for word, from this article that was posted at XBox.com:
https://news.xbox.com/en-us/2020/10/13/xbox-series-x-and-xbox-series-s-backward-compatibility-update/On the surface, it sounds like the XBox Series X and S hardware can take anything and boost its performance up to the point of doubling its frame rate. OTOH, they also throw a lot of conditional statements in with it to make it sound more like a case by case basis, depending on the game and how much involvement its developer might have in the BC process.
Here's a snip from the article I linked that would take a Philadelphia lawyer to parse:
"In addition however, the backward compatibility team has developed new methods for effectively doubling the framerate on select titles."There are two things that stand out to me in this statement (which was also read in the clip you linked):
1.) Microsoft has a backward compatibility team that targets "select titles".
2.) Microsoft's backward compatibility team can make doubled frame rates happen using "new methods". Who decides what these "select titles" are and do these "new methods" require ANY involvement by the game's developers to accomplish doubled frame rates?
The article goes on to get even more steeped in conditionality with this:
"While not applicable for many titles due to the game’s original physics or animations, these new techniques the team has developed can push game engines to render more quickly for a buttery smooth experience beyond what the original game might have delivered due to the capabilities of the hardware." At first glance, the condition I underlined "game's original physics or animations" struck me as a reason PGA TOUR 2K21 might not lend itself to frame rate boosting or doubling. I then got to thinking about how the PC version works. It can have its vsync turned off, or set to 30 or 60 Hz, and run the game at 25 to 80 FPS (depending on how I have the resolution and graphics details set), without adversely affecting the physics or animations at all. The XBox One X version of this game is in essence the PC version with fewer options in the graphics and resolution setting menu; why not just put a few of these options back into the Series X version of the game?
I can't imagine that PGA TOUR 2K21 would be one of the "select games" on Microsoft's backwards compatibility team's target list, but if it comes down to just providing an encoder switch that somehow bypasses at 30 FPS lock, I'd have to think they'd make it happen.
Realistically, I'd think HB Studios/2K would be willing to make the changes necessary on their end for the game to run at 60 FPS on the Series X. I think it would also behoove them to add VRR support. To they layman, neither of these sound like they'd be all that daunting a task. It would certainly make the game more attractive to Series X owners who are going to be starved for Series X native games out of the gate. Maybe one of the devs will weigh in here and set us straight on this?

BTW monitor arrived 
You dawg! Have you had a chance to test it out?