That is true, and it's still the best. I think the only other competitor would be Reddit, and since they suck there's really no competition at all. Even if you don't consider bitcointalk the "best" bitcoin forum, it would be hard to argue that it's not the most active one. Sig campaigns and bounties continue to make that true, but it's true nevertheless.
Reddit really is not a forum at least I think its more like a news sharing site where people can comment a small amount on their reaction instead of being a forum. The Bitcoin reddit community is not as in depth as Bitcointalk for sure and as a platform is very flawed because people can just create multiple accounts and upvote a certain agenda to get exposure. Bitcointalk at least does not have a broken upvote system.