Hey man, sorry.
What you’re saying they said doesn’t make sense to me 
The first blue post they came out with that even mentioned the beta process noted length of account not length of your sub.
People who started in Vanilla weren’t subbed for months/years prior to the Beta announcement and were still invited and people who started day 1 and never had a lapse in their sub since then weren’t.
I think you misunderstood what they were telling you.
Regardles of if I haven’t subbed for the past 10 years if I was subscribed the time of the beta my account would still come up as 13+years old.