Very interresting article, thnx!
One detail:
Flameouts have occurred on engines made by General Electric Co. and United Technologies Corp.'s Pratt & Whitney unit
Question arises if absense of incidents on RR powered aircraft means anyting. (# of occurences is still low).
Only thing I can come up on is GE & PW share two spool technology, while RR traditionally uses three spool engines. Maybe those are less sensitive to ice in mentioned conditions..