Looks like pop rivets to me too. If you pull the armature & brush plate, you should be able to see the rivet ends to know for sure, the tube will be distorted, stretched fatter than the hole. It might be easier to hold them from spinning with needle nose as you drill the heads off anyhow. And once the head is off, it often still takes a reasonably strong pull to get it out, or a few taps with a hammer and drift (punch). If the holes are threaded still, you might have to unscrew the rivet stub( the rivet tube being set also fattened it, so likely is grabbing the threads.
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