Your absolutely right, someone will come along and ask questions about these polls. I'm just one of them.
1) Polling is so inconsistent that the end result has to be scewed. It can be by 1% or 20%, we don't know, but scewed it certainly is. I never, on linux nor windows, get asked to take the survey. The last time I was asked to do it was when I plugged in a temporary 980ti while waiting for the 9070 launch. For context, I have had a 6700XT, 6950XT, a B580, RX 9070 and 2 different platforms, 3 different CPUs and several different os installs(between windows and linux) over the last 3 years time. Just the one survey though.
It wouldn't be that difficult to tie a hardware setup to a user account and detect when hardware is then changed and trigger a survey and update the end result while creating a separate group just for internet cafe machines while still counting them.
2) I'm fairly certain the 9000 series doesn't get picked up correctly by name and is lumped in with other AMD GPUs under a generic name as it isn't on the charts whatsoever by its own name. If you take a look at this screenshot from today you can see a decrease in feb and a new increase of almost 1% in marts. Interesting

. What was it that happened in start March? The 9070 launched. So that is your own words a possible sale of 1.000.000 GPUs for AMD/RTG(1%=1.3 mill users). Couple that theory together with CEO statement of "
9070 XT selling 10X than prev gen in 1 week" I would say that AMD/RTG should be pretty satisfied by the result.
My 9070 after I trigger the survey manually:
I will absolutely agree that the pricing of the 9070 series isn't great. Some countries is worse than others. Overall it stinks. BUT! there is a reason for why the 5070 can be had now for less than MSRP in some places and the 9070 can't. Supply and Demand. The 9070 is clearly selling spite the price whereas the 5070 arn't versus available inventory. Nvidia doesn't do charity, never has, so the lower price is clearly to move some inventory that is otherwise stuck on shelves. Neither does AMD btw, which is why the price is where it is, as shelves are emptied all the time. But now that availability has improved, the prices have come down a bit. Supply and demand.