Honestly I really don't like nor care about Genji since it didn't contribute anything to the original world and yet they got treat like canon and being featured in an article or videos and makes a lots of people mistake it and treat it as canon. (I don't like it when some fan project treat or change canon sources badly like using cultures that didn't exist in avatar universe etc, it affects the plotline or thene that makes zero sense, but that's just me personally nitpicking.)
I don't like how LoG treat Korra so badly. Killing off Korra just to pave way for the fanon character like that. Korra survived a lot of grave and dangerous situations and to kill her off by some explosion is just ridiculous.
As for fake avatar things, if we cut off the released date of Kyoshi novel and Genji release date ordeal away,
considered that there's a ton of avatars out there, fake avatar situation would probably exist even before Kyoshi era so I think Genji didn't copy Kyoshi's fake avatar thing though.