Had the same issue, the patch burned out your physical wifi adapter - its a gonner, with the repair price to RMA the motherboard out of warranty is basically a new device (If you can even RMA it in your country).
I've read online that the latest patch burned out the wifi adapter. I'm in a country that has an ASUS service centre, but doesn't service the ROG Phone, nor can they get the parts to service it. So for something that was caused by ASUS, I have to RMA...
I've been told to factory reset, but it seems like its not worth loosing all the data since everyone here has tried it. Patch this ASAP please, or give us a rollback function! Like everyone here, we can't even try the solutions since the wifi adapter...