I'm all for checking people's posting history when they pop up and start throwing accusations around / demanding answers like they own the place.
We had another one like that a few threads ago; they referred to people who use the search facility the same way you do (strange and creepy). 🤨
It is also a really useful way to check if somebody who's posted a click-bait thread is genuine. The contradictions it can throw up are useful so that people know they're wasting time on a non-genuine poster.
It's also a helpful tool when you know a poster posted something useful in, say, the Christmas topic, but you can't find the thread.
If we weren't meant to use it, it wouldn't be there to use! 🤷♀️