sure, sim training should be OK with even ground instructor ratings/certs.
I'm not sure about IPC, but it may fall into the instrument training area.
It's not just the interpretation/clarification, I believe they changed the wording to make it clearer.
Basically, when I checked the rules, they also clarify that only 'instrument basics' for issue of PPL can be done by non-instrument rated CPL/CFII, rest has to be proper instrument instructor and FI on relevant class/category (incl the instrument for CPL).
Sure. We both learned something new about the regs and 'recent' changes by digging into the topic a bit. So win-win situation, even though OT for MEI rating/cert.