^Why did you reply as if you were sending a work-related e-mail? No offense intended, but it kinda comes off as weird in an informal internet forum, tbh. To answer your question, there's no in-game help page, though some information can be found in the detailed stat page by clicking Show Details at the bottom of the character screen and then hovering over various stats for an explanatory tooltip. Since the game is brand new and received heavy changes since the beta, there's no online resource as of yet that's much use, at least not that I've found.
Anyway, as for the topic of the thread, passive skill nodes don't currently have any effect on the Aspects, so no it won't make any of them unusable. It's also worth noting that to get to that node you have to take two nodes which convert 30% of elemental and ocult damage into physical, so even for non-material damage which is affected, you'll still do at minimum 30% of the previous amount baseline.