Voters: please reconsider your ups and downs. I think the “Are you an expert” question triggered a lot of downvotes when it was in fact asked in good faith to judge the person’s perspective of easy and hard.

And I would say there is no way to ask that question in good faith. (Tedious proof by cases left as an exercise for readers.)

The correct question would have been, does anyone else agree with the statement.

In this particular case, the amount knowledge needed (of e.g. Lean language, math and Erdos problems) means any credible statement about the difficulty requires an expert.