This is not new.
The original FCL-2 from 2003 says in 2.125(a) second sentence:
"A registered facility is limited to giving training on single-engine helicopters with a maximum certificated seating capacity of not more than 4 persons."
I think they are just enforcing it now, maybe the EASA plays a role in it.
Dennis, you can still pass on your knowledge by giving these new PPLs a type rating on what ever turbine they wish.