Was he hunting???
In the ATC video you can clearly see a CA warning for the involved flights.
There is another CA for a flight (A319) to the south.
And why they asked the CRJ to land on RWY33 instead of 1?
https://www.youtube.com/watch?v=bHBKptJWXtU
>Does TCAS work when ADS-B is turned off
TCAS can still work if ADS-B is turned off. TCAS uses radar signals to detect and track nearby aircraft, relying on radar information from its own transponder and that of other aircraft equipped with transponders.
https://www.faa.gov/documentlibrary/media/advisory_circular/tcas%20ii%20v7.1%20intro%20booklet.pdf