That's for sure.

Since you take the freedom to repeat your narrative surrounding your unfounded opinion over and over again, I will take the freedom to repeat my own unfounded opinion and the one simple fact I mentioned as well. The WiiM Ultra technically can support AirPlay. The feature has been removed prior to general availability. It did work during the initial beta testing. WiiM had no interest on their own to do so.
Funny, you're asking for facts supporting my opinion while your own opinion goes along with not facts at all.
Funny again, that the list compiled by WhatsHiFi doesn't mention WiiM. That makes it not all inclusive by definition, doesn't it? Fact: AirPlay is absolutely meaningless for everyone using Android devices. But you know that already. Anyway, your whole argument is pointless. Listing the devices supporting AirPlay says absolutely nothing about why the Ultra is not on that list. The truth is not a matter of majorities or minorities.
Because Apple did certify the WiiM Mini. That's an easy one.

Like they certified the Pro, the Pro Plus and the WiiM Amp. We still don't know if or if not they will certify the WiiM Amp Pro.
In the end it doesn't matter anyway. The Ultra is not allowed to expose itself as an AirPlay receiver and this is not going to change.