RFI – Uwe Schmidt (a.k.a. Atom Heart, Flanger, Senior Coconut, etc.)

does he still use a dozen different names or is it pretty much all done as Atom TM right now?

I think he's settled to the Atom TM moniker. His site has a comprehensive discography, and even though it stops at 2016, you can see he hasn't used any other aliases with his solo recordings for years:

https://atom-tm.com/DISCOGRAPHY