could it be somehow the linux display driver damaged that screen? while I use linux but I do think newegg has a point. A policy is a policy and newegg can not verify all those 100+ linux distro on the market.
Generally speaking you don't want a screen to break no matter what signals you put into it. It would really suck if a virus could actually destroy your computer.
I agree that ideally the hardware should be robust about it, but from a practical perspective it's a lot easier for a niche OS to fix their bugs than to get manufacturers to test those corner cases.