Ok, that’s too bad but there’s still hope.
You may be able to use a custom DTH originally put together for the Xiaomi/Aqara leak sensor. Here’s a discussion and link to the DTH:
If that does not work, then a custom handler will need to be created.
The other option could be to use Tuya’s hub with this device and then integrate Tuya with ST (it’s called a linked/connected service if I remember right). I don’t do this, but there are others in the community that do, so I recommend doing a search to find more info on the Tuya/ST integration option if you want.