What started as a helpless repetition of Wi-Fi getting cut off is actually something else. There are so many levels of understanding this: that multiple correctable errors were flooding the ring buffer within seconds and were triggering "irq 16: nobody cared", that PCIe was "mucking" with ASPM.
I had to compile a lot of patched kernels to see any difference. And the patched ones were working.
Well, now that I have upgraded to v6.17.10, I can certainly say that no multiple correctable errors appeared and… everything's fine.
I tried to remove my workarounds like Jenga blocks, and my system was still stable.
Thanks a lot to Mani and many others involved in fixing this bug. And thanks to the ones who read this post. I can finally sleep easy, knowing that a year later, every OS will come with atleast the version v6.17.10 preinstalled, and I will be able to distrohop pretty efficiently, without my touchpad or my Wi-Fi acting abnormally.