This is why the ‘look it up’ rule is by far my least favourite that we have. It’s unnecessary, pisses people off and just causes ambiguity as you’ve shown. I’ll say it now that I’d rather we just get rid of it.
The reason I let that one go is that the asker’s confusion was not about where they could find Strength. It was clear they thought they knew where it was, and were only asking why they weren’t finding it there. That’s a whole different question, and where the distinction was for me. Obviously the answer in both cases would have ended up identical, but we don’t take questions down assuming knowledge of their answer.
Think of it this way: if the asker had been correct as to Strength’s location, would we have taken down the question? No, because there would have been an alternate explanation, e.g. ‘you picked it up already’. If that’s true, then the question is no longer as simple as ‘look it up’. Of course, in the end it really was that simple, but again, we don’t moderate assuming the answer goes one way or another like that.
If you want a hard and fast rule, I’ll only take down the question when looking up the location is guaranteed to resolve the question. In this case, it was not, because there was the possibility the asker was correct in their assumption, and the answer would have needed more explanation.
To answer your other question, if we give leniency because people might not know where to find information, then the rule is even more arbitrary and basically impossible to moderate. If the answer could be looked up on the site, no matter where/how, the question goes basically. Another reason why this rule sucks, it just leaves askers confused.