A-V-8R: Whilst I agree that TCAS doesn't explicitly warn of 'heavy traffic,' if the unit gave several TAs in short succession, it is in effect warning of such a condition.
50-100 ft to avoid another plane???? Sounds like another distorter being confused.
I was under the impression that TCAS attempts to resolve conflicts with 300ft of vertical separation (I stand to be corrected), in which case this particular corrrespondent can't really be accused of hyperbole.
Regards,
BGPM.