S/He could have said, “the timer has been proven to be excatly the right time to be fast enough for the user experience but slow enough to prevent the bots, we can’t do anything about it sorry”. IE proving that he had considered it.
No, he couldn’t, because he doesn’t know that (I don’t think). He could have said, “the timer has been set by the site owners and is outside our control.” Anything else beyond that is guesswork.
He doesn’t owe you and your vapourware subscription any “proof,” he’s doing you a favour in replying at all. Of course he considered it, that’s what we do.
We could raise it with the site owners, of course. However I trust that the timing has been set for a good reason, and I believe it works because if it was a real problem then we’d be sat here going “oh god, not this bloody issue again“. Therefore, in my opinion it’s a non-issue and the Tech bods have far more pressing issues to be working on, so I shan’t be bothering them with it.
Should other Moderators disagree – and they might, I only speak for myself – then they may well make a different decision and pass it on. But as I said earlier, if you don’t like that decision, you can ask them directly yourself.