Don´t mix things up.
Appendix 1 to 2.205:
FLYING TRAINING
9 A SINGLE-engine IR(H) course shall...
The instrument flight instruction shall include at least 10 hours in an IFR-certificated helicopter.
10 A MULTI-engine IR(H) course shall... [ The instrument flight instruction shall include at least 10 hours in an IFR-certificated multi-engine
helicopters.]
Two different courses, depends on which one you take...