Yes, you are correct that TSM does a thorough quarantine. They run a nice operation. You can call or stop by and talk to them, either about their livestock or quarantine procedures. They’re more than happy to explain their QT methods. Like usual, you pay a premium for this extra step they take but it’s well worth it.
+1 to this. I live about 20 minutes from TSM and go there often. They do a very full quarantine/conditioning for every fish they sell that includes multiple rounds of medicated treatments, observational period, and getting them to accept frozen foods. I know the general consensus is that you can't trust anyone to QT but yourself, but if anyone's ever gone there, they'd get it.