PBSUAS

Correct, at least the other tools I've run so far. Topo animation runs fine and produces an output - https://www.whiteboxgeo.com/manual/wbt_book/available_tools/geomorphometric_analysis.html#TopographicPositionAnimation

Same here.  FYI, I'm a light user of ArcPro on desktop. I use CAD, AGOL and Global Mapper heavily, but very light use of ArcPro (mostly managing online layers...

I cannot open the tool. When I click it from the toolbox list, the screenshot in my first post is all I see.