It's extremely unlikely the TCM would cause the pulse generators to fail.
(Read this to mean that theoretically I suppose it's possible, but I can't
really imagine a situation where it would actually occur). It would
basically take a short circuit, and would be, in fact, more likely to blow
up the TCM than the pulse generators.
It is possible, however, that the TCM is the root cause of the issue.
I've not seen this, but it's a plausible solution and I'm in no position
to question the dealer who has your car and can physically inspect it.
If you look at TSB 03-40-022, step 7 is to replace the TCM. If you're
following the TSB, you've already replaced the pulse generators and the
reed switch and the car still isn't fixed. Regardless, it sounds like
they're giving the car the attention it needs and don't intend to return
it to you until they're convinced it's fixed.