I have used many Intel AX200 cards with no issues. They don't have the throughput (on certain client devices) that AX201 cards do, but they are still faster than whatever it was I replaced them with. Each and every customer very happy with the increase in the throughput and responsiveness of their laptops.
On my own 2-year-old laptop, I saw the same increase in performance. Only when I compared to a CNVi AX201 based laptop did I see obvious improvements over the AX200 adaptor.
Nothing to believe here except what is in front of my eyes.
We can both be sharing links to support any 'side' we want indefinitely. Let's just say that some know how to properly switch out cards, uninstall the old drivers and then install the proper drivers and ideally, use a new SSID too to get the full performance they offer.
If any are truly defective? Return/RMA at that point.