Here’s how I’m planning to handle the “they were nobody” moment in TLJ. It’s only Kylo that explicitly states anything about it, and he doesn’t say that they are buried on Jakku.
It works…but it also breaks my heart to see this (imo) powerful scene diminished to accommodate a poorly conceived retcon. I think that Rey looking inward and admitting to herself that her parents were nobodies is part of what makes the scene work. Just my opinion of course, but if you choose to go down this path I will probably stick to earlier versions of Legendary or make my own edit.