The helicopter should never have been allowed to be that close to landing traffic,
absolutely . the altimeter talk is just a distraction or at best contributing factor, Not the cause .. which brings us back to the safety assessment of the procedure , which the NTSB did not mention at all,, but I am sure , or at least I hope they will go into in their final report.
In any case the procedure us currently withdrawn until end of March and I sincerely doubt they will re-install it before the final report is out. ..
A couple of new info points the NTSB clarified : Both aircraft were on VHF , so we can drop this UHF discussion , the Blackhawk had ADS-B equipped but was not transmitting , it was check ride with NVG, and they most probably all had them on .and there was a last second evasive action attempt by the CRJ crew, which go a TA previously . On the TWR, the CAs are displayed in the BRITE even with audio on ..
For the rest we have to wait until the next NTSB briefing