I fail to see how that shows that g2 had 'more marketing than most Lego themes',
Bionicle is important both to Lego's history and the fans, it makes sense they'd announce it at comic con, Ninjago wasn't an evergreen when it launched, it was a fresh IP with no history.
G2 had about average marketing(animation, books, comic/graphic novel), unfortunately it was really poorly handled,
Web animations/Netflix exclusive rather than TV series, no activity books and the same cookie cutter mobile game Lego makes for all its ip's but without any incentive to buy the sets, virtually no presence in the public consciousness, solid gold masks (IE massive waste of resources).
On the surface the marketing seems to line up with the usual MO, however when you look at the specifics of it you start to see exactly what went wrong.
Taking the money from the gold masks and putting it towards an oog and a TV show I think could have made g2 successful(at least enough for a third year) we'll never know for sure, but, let's for the sake of argument say the leak is true, 'tv show and app' sounds like a step in the right direction to be sure.