No, it’s solely based on observation of on board activity. Here’s a fairly recent example that begins at post #40. Rick Kitchen’s contribution is post #59. An older example is here, starting at post #2, with Rick Kitchen’s contribution at post #32.
The trend started before that. Here is an ATMB topic discussing it. I believe this is the first reference I can remember:
A few days later,it was executed here with a specific reference to it in post #7. Rick Kitchen’s participation begins in post #75.
Is your understanding different?