Audio out of sync while playing UHD dvds on Xbox series X?

Depends on your model of TV, consult your manual for audio delay adjustment. Many lower end models leave out features like this

My xbox one x just plays regular dvds...blue rays...uhd discs...game discs!!

Its a dvd

Nope, not quite right.

Original Xbox - DVD

Xbox 360 - DVD (or more specifically, DVD-9).

Xbox One - Blu-ray

Xbox One S and X - UHD Blu-ray drive, but games still on standard Blu-ray.

Scarlet will have a UHD BD drive so that can still play all formats of movie discs. Likely that games will be on 100GB discs.

I ended up doing that as I was a bit worried about the optical drive in my Xbox One x when it refused to play certain 4k Blue ray disks.

My old Xbox One X had issues with some UHD movies, so much so that I too bought a stand alone UHD Blue-ray player. Playback issues were (probably still are) common on the One X. I've never played a single Blu-ray, UHD Blu-ray or DVD in my Series X.

There really isn't any need to test all of the discs. Test a few. If the discs are in good clean order they would have played on another BD player.

Sorry about your issue there.

Is it just this one game or do other Xbox 360 discs have issues?

The Series X optical drive contains two lasers, one for reading DVD discs and one for reading Blu-Ray discs.

Have you also tried DVD movie discs to see if they play? They must be DVD discs, not HD or UHD BD discs.

Unfortunately if the drive has a fault reading discs, you'll need to get it repaired. If your console is out of warranty it will be at a cost.