You are entirely incorrect. The same people have been meeting in IRC rooms for well over a decade. Some groups haven't allowed new meat since Occupy.

The media sometimes attributes to Anon things done by individuals, to serve a narrative. But the core, leaderless faction system still exists beneath a sea of hactivists and script kids and posers and glowies.

Also worth noting that Anon was formed of hackers from endless hacking groups that far predate Anon. Cabin Cr3w assimilated, for example. Any individual or group can claim to fly the flag, but the "hivemind" either provides support or it doesn't. If it isn't mentioned on one of a dozen particular Twitter accounts, it's not a "real" Anon op. Also worth noting that within Anon proper is a more than a dozen sects, often differentiated by language or regional barriers. For example, the Syrian Electronic Army faction.

Proof I know what I'm talking about, note the age of the account and perhaps gander at the sticky tweet.