Platinum is getting credit for being the made up of the dev Clover which was killed by Capcom. Console only, makes wild Japanese games. It is kind of weird to put in a dev that just put in a two year gap since its last game at number 4 so, I think its safe to say this is just a "favorite" developers list.
Missing Obsidian, maybe From Software at spot 10. One of my personal favorites Arc Systems not included in top 10 either haha.