Blitzwolf BW-DS04

Is it possible to use this soil moisture device with Homey?

Not without an app.
An alternative can be:

The app works with the Misol Gateway and the Misol Soil Moisture sensor

What do You think about trying to listen this Blitzwolf DS-04 via some “rtl_433”? Is it possible, for example by using some device and integration with Home Assistant?