Correction to my earlier comment. I was unaware that there is both a complete linux distro called "deepin linux" and there is also a desktop environment called "deepin". I did run deepin linux in a vm for testing. Now deleted.

The deepin desktop environment is available in openSUSE 15.4 repos through yast and also zypper. To install through yast software --> Pattern --> Graphical Environments --> Deepin Desktop Environmental

Likewise as above for the "mate" desktop based upon the original query.

tom kosvic