Actually, I didn’t.
I consider exploration activity to be exploration activity, as simple as that. A player who spends in a system using the FSS, flying to a biological POI they spotted, probing the planet to reveal them, landing at one, and scanning what grows there to have been just as active as an explorer who jumps and honks as fast as the game permits them to.
I’m honestly surprised to find that you don’t.
Ah, I left out three words that I meant to say. To clarify, here's my edit: "even though you know that in that thread, "exploration activity" was often short-hand for "exploration activity via number of new systems"."
No offense, but you've left out the end of my quote, and taken out of context like this, it seems like I think exploration consists only of discovering new systems, which I obviously don't.
You could also expand it to "exploration activity measured via number of new systems", if you'd like. We have data on that, we have data on squadrons' exploration data sales, but we don't have data on time spent. (Well, we do have a few dozen veteran explorers sharing their stats over the past year, but that's obviously not a representative sample size.) You yourself quoted the monthly systems vs date chart from that thread.
My earlier points in my reply still stand, of course.