You will find that ALL third-party WGMs lag behind Creo integration into Windchill by a few months (or more).
If the Revit files are just AutoCAD formatted files, the WGM should not have any issues. But I don't think that is the case. 😞
If it was, you would not need WGMs for AutoCAD basic, Electrical and Mechanical, as they are all the same formatted files. I do understand that xrefs and other imbedded 'symbols' into these files may be handled differently, but I am no AutoCAD expert in understanding the file format structures.
I did see 2020 but only supported with 11.2.1.