It may well have changed because a 'TCAS climb' report to ATC can be potentially false information if the RA reverts to a 'Descend, Descend now' RA when multiple intruder aircraft are present.
Consequently it may then not be an option to give another TCAS report to ATC due to frequency congestion. With the new procedures ATC will not be lead into a false sense of security thinking that you are doing one thing (climbing) when the RA reverses its instruction to a descent.