People still believe that these type leaks are 100% official!? It's like they believe the link-change is 100% solid evidence with no flaws to look into. ._.
Well, it's better evidence to go one than most leaks you see out there. I'd chalk this up to being likely. Not 100% confirmed by any means, just likely.
I think people are taking it willingly mainly because it's not something you can say is fake. It's on the official Japanese Pokémon website. The only issue is that it's unclear whether or not these types actually refer to starters.