Yes, you’re spot on. It’s a historic thing, from a dark time when a rogue tuning firm were advertising their shoddy wares on the forum, and then going back and editing posts to make a nonsense of threads whenever they were challenged. Arguably the time limit for edits could now be removed, in fairness, as all that’s ancient history.
I think you’ll find the magic editing pixie has changed them for you, anyway
cheers
James