Its not completely fixed. I accepted an invite by a group of new players I was helping when they pulled an NM in Highlands. Since I was healing them along to help out I had hate on the NM. When I took the invite to kill it, it synced my 75 BLM to level 10 and NM w00ped my ass. So yeah. I died to a Highlands NM as a 75 BLM. It also synced me to a low level group when I was in the PT already but teleport-dem'd myself and was synced low when I zoned in.

Maybe you're talking about the Nas-specific OWNMs? These NMs can and will sync your level to theirs no matter the difference. The max sync gap only applies to syncing initiated by the party itself.