1971 La318 Starter issue?

Sounds like either a failed starter drive as mentioned, or some bad spots on the ring gear. A whole starter for a bad starter drive? Not this white boy. I'd repair the starter if that's what it is.
But don't forget that in today's society, most people are into toss the old part and buy a new one.
I would have to hear it. Mopar starters when they are good and the battery is fully charged will go Wing ding, ding, ding If yours doesn't spin over like this one you have issues.

Wing ding, ding, ding?
Well this is an embarrassing update. I recorded it to upload here, and when watching it myself I realized that it’s turning over just fine. I have all the plugs out so there is no compression except on the cylinder with the compression tester. Hence the occasional proper sound with whining in between.

I’ll go get myself fitted for my dunce cap later today. Lol.

Thanks for all the helpful input though, everyone!
If that is the worst car related thing you do this year, you are doing better than me. I have one of those, "Mike, you dumbass, what did you do now" moments all the time. BTW, where is Lindsay? My daughter lives in Aurora which is just north of Toronto.