tuya-convert: BSD33 can't be flashed, not an ESP

I received some smart sockets which I identified as BSD33 (Tasmota template, AliExpress listing)

I tried to flash it but it stays in

SmartConfig complete.
Resending SmartConfig Packets
.................

loop. I found the following line in the web log: WARNING: it appears this device does not use an ESP82xx and therefore cannot install ESP based firmware.

As far as I seen it’s glued together so I don’t want to break it, but if it helps I could set up one with the tuya cloud.

The logs: mqtt psk udp web wifi