From a quick look Anandtech are saying it's a 144hz panel, Acer rate it at 200hz for overclocking, they weren't sure if it would be covered under warranty or how many panels would even hit that refresh rate, I would say the way they stated it they were sceptical about it.
So for most people, will run below 144hz, buy a panel that runs 144hz, pay more because it might overclock to 200hz.... not sure where the appeal is in paying more for something that might not work and that you almost certainly won't actually use anyway and will feel almost identical to a 144hz version of literally the same panel.
That is before you talk about the absurd res for that size or frame times. Difference between 60 and 120hz screens, 8.3ms drop in frame time. 120-144hz difference, 1.4mz, 144 to 200hz difference 1.9ms IF it works which doesn't seem clear. There are diminishing returns from higher response rate. What panels need is better response time from pixels which is down to the tech. OLED will make the tech underneath it run that much faster and is able to do so with better colour reproduction, brightness and black levels.
Paying big on silly techs that don't really provide anything seems completely pointless. Giving up resolution for size/response that provides no real benefit seems even more ridiculous.