You can also use it for DaisyDuino and Oopsy~! I talk about how to use it in the video tutorials!!
You can get it working with pd2dsy but not with plugdata nor pd2dsyGUI yet (as far as I know). If you use pd2dsy via terminal, you can do something like this to use the ST Link: Patch.Init() and stlinkv3 - #12 by Distortion
ST Link is super convenient to have by the way!!