I suspect SE is referring not to the thousands of us per server who played in 2012, but the possibly tens of thousands per server who didn't pay, and maybe stopped playing within months of launch. Their dormant characters were moved with the server merge, too.
According to the roadmap, everyone who played version 1 ("FFXIV service account holders") qualifies to play in beta phase 3. This is also when SE opens up "overseas" (not Japan) "data centers" (servers).
