You do realize companies will say all sorts of things to make their product look good. All I know is that I would never consider any Apple laptop to be a gaming laptop. If the game runs fine, then great, but I would never count on games working correctly on an Apple laptop.
Are you playing those games at 1080p resolutions? With this GPU you will most likely need to run the game at 1080p instead of your laptop's native screen resolution.
Even AMD never mentions gaming for the Radeon Pro 5500 GPU (instead AMD is advertising 3D Content Creation and Video Editing):
https://www.amd.com/en/graphics/radeon-apple-5000m-series
And here are some GPU benchmark comparisons to dedicated desktop GPUs. The Radeon Pro 5500m is at best 1/3 of the performance level of a high end GPU from 2017 and the gap quickly increases from there.
https://www.videocardbenchmark.net/gpu.php?gpu=Radeon+Pro+5500M&id=4165
This article is showing the 5500M as being comparable to the AMD RX570 and AMD R9 390. The RX570 is just an average Desktop GPU from 2017, while the R9 390 was a higher end GPU from 2015. This helps to reinforce my earlier notion that Apple laptops even with a decent mobile GPU is not a gaming laptop. Yes, it will be able to play some games, but which ones....that is the question. This is not the GPU gaming powerhouse you think it is.
https://www.techpowerup.com/gpu-specs/radeon-pro-5500m.c3463
Now games are notorious for crashing even on a high end gaming desktop system, so it does not surprise me to find games crashing on your laptop. Games are also using the GPU in ways that other apps are not so games will encounter GPU driver issues whereas other apps may not ever have a problem. While there can certainly be a hardware GPU issue here, there can also be a GPU driver issue at play, or some bad code in the game, or some other third party app you have installed that is interfering with the normal operation of macOS.
To look for possible software issues run EtreCheck and post the report here using the "Additional Text" icon which looks like a piece of paper. If you give EtreCheck "Full Disk Access", then the summary of the recent logs will also be included which may provide additional clues.
Like I said before, you need to check with the game developer to see if this may be a known issue with the game on this laptop or perhaps just an issue with macOS. Unless you have some third party software that is interfering, your best option is to contact the game developer for assistance. Since you posted a link to a thread from last year, then obviously some others are having similar issues, but did any of them ever contact the developer so the developer could attempt to address the issue?