I think I would rather them perform the TSB check before I change the fluid (draining fluid may affect the quality of the check in the TSB). Although I agree that it's suspect whether a little magnet can detect any problems. I also don't like being one of the firsts they perform such a procedure on so I will wait a little to get the TSB done.
As you mentioned, this confirms the frequency of changing the fluid or not doesn't seem to prevent a broken belt.
As you mentioned, this confirms the frequency of changing the fluid or not doesn't seem to prevent a broken belt.