You're using a sample size of 1 and multiple unfounded assumptions to make an argument. Why do you think that's a better source of information than the amount of characters and experience others have?
I'm not saying your experience didn't happen, just that you're making a lot of assumptions that may or may not be true:
1. You assume the PUG got hit at once because they were in the same PUG, rather than a series of bans going through at once (bans are always processed in chunks on tues-thurs at ~2am est).
2. You assume that being in Sortie was what got you flagged, rather than previous cheating you'd admitted to.
3. You assume that the report is what triggered it, rather than a general selection of Sortie offenders.
Some of these might be accurate. They might all be accurate. That doesn't mean that other methods of detection don't play into it, and others have
much larger samples of both cheating and bans than you do.
If you truly believe reports matter, start sending them on known offenders and track the results. My experience has been that they don't.