Is there a problem with the understanding?
I can confirm as per JAR-FCL 2.285 (amendment 3) the holder of a CPL(H) and IR(H) satisfies the knowledge requirements for the issue of an ATPL(H).
Yes, This satisfies the
knowledge requirements!! You'll still need to satisfy the other requirements before atpl issue. (ie night, Instrument, multi crew, requirements etc)
The holder of a CPL(H) and IR(H) gained under previous amendments of JAR FCL 2 up to and including Amendment 3 is credited with the theoretical knowledge requirements for ATPL(H) and IR(H).
If you gain the CPL(H) and IR(H) after Amendment 3 then you will need to do the ATPL exams again but probably get a reduction in requirements due to the fact you've already jumped through the hoops previously.