Seems like a safe bet that's what it is since "Sysinternals Process Explorer for Mac" is the opening title of the README :D.

Certain things like Sysinternals tools outside of their native platforms is somethnig I hope to see more of. E.g. I had a SumatraPDF and 7z GUI clone on Linux for a while just because I liked it more than the Linux PDF readers (now I have a home grown app which handles more formats). It looks like this one could use a bit more time in the oven though.

Well, if you look at the commit history, the first ones are authored by Mark Russinovich himself.