While attempting to organize, I came across my and my son's former PPC equipment, namely; Safariland Comp II's, associated loading blocks, holders, Reno holster, Safariland holster, inner/outer belts, etc. Do current competitors still use such equipment?

There sure are. I shoot in the Flint Combat League every fall and winter here in Michigan. There are plenty of men and women still using that equipment and there are more than one league in our area.
Not as many law enforcement officers shooting PPC as there once was, which is a shame because it's good practice, but there are a lot of civilians that have taken to the sport.

I still do! Always have, but I did get a lot of it from my shooting buddies when they switched to L frames.

I still have my L frame stuff but gave my K frame stuff to a new shooter years ago. Last year I started shooting my model 19 again in the PPC matches so before the nest season starts I need to get what I gave away again.

Yep, k frame all the way!