No, TCAS alerts are inhibited at low altitude. It goes in steps by altitude (above ground) from no alerts at all, to only traffic warning but no resolutions, to resolution but no descends, to normal full operation.

Yes, TCAS II warns all the way down to 100m AGL (around 320ft above the ground), and they were already between 1000ft and 1500ft (~400m).

It may or may not have advised what to do (to climb/descent/etc.) because that is turned off below 1000ft, and they were approximately at that altitude at the time.