I have some WiFi devices on the Tuya app that I want to take out of the cloud.
I’ve been reading up on OTA Flash Tasmota and understand this is the way to go
Does Tuya Convert do the same thing as OTA Flashing Tasmota?
Pretty much, but not all Tuya devices can be flashed “Over the Air” (OTA) so you may have success.
I have done many such devices, 2NiceUP & TCP Smart Plugs, LED modules, Sonoff devices etc. The plugs were able to be flashed over the air using tuya-convert, the led modules had to be taken apart and wired to a USB programmer to be flashed.
Have a look in https://templates.blakadder.com/ and see if your devices are supported.