The 8KX is highly modular and far more repairable than other HMDs on the market. It’s very possible that a single point of failure exists and that a part may be available for repair. It may be as simple as a DP cable, in which case if you need one I have a spare and would gladly send it to you no charge.
Hopefully pimax can evaluate this further. On one side imho if the ticket was maybe filed prior to the warranty ending(which imho should start after being delivered) they should indeed help him out.
Pimax while at times support has been hit and miss; there has also been clear cases of them going above and beyond. Unfortunately most often a customer whom has a really good experience are not often as loud as a customer whom has had a bad experience.
Imho pimax should look into maybe contacting ifixit as a possible reseller of repair components.