There are very few cases where there's a good reason for a printer of any kind to be on WiFi and even less for a receipt printer. If it's being used in a portable application with a laptop or mobile device that's what USB or Bluetooth are for. If it's sitting on a checkout counter and needs to be shared between multiple PCs that's what ethernet is for.

I'm not saying that there are absolutely no situations where WiFi is actually beneficial in a printer, but most of the time that a printer is connected to WiFi it's just making the printer less reliable than it could be if it was connected another way for no reason other than the user not liking wires.

A universal truth of networking: If it can be practically wired it should be wired. Wireless is for things that move and things that need to be put in weird spots it doesn't make sense to ever wire.

So, after seeing how cheap and available these Phomemo printers are and with this CUPS driver looking like a good option, my instinct as someone who also wants one of these sitting permanently on my home network as to appear all the time on all my machines' available printer options, is to get one and tether it permanently to a tiny linux SBC that has bluetooth and running the driver and print sharing. Like the OrangePi Zero 2w I have sitting unused in a drawer somewhere collecting dust.