But your other argumentation is quite interesting. Do you also hold that 0 physicist ever worked on the theory of phlogiston? Or on ether? Neither of those to exist. Because your argumentation would also imply that. I would reject that suggestion. So even if I were to grant that this problem does not exist, which I do not, I would disagree with the conclusion of your post.
The pay gap as caused by discrimination has not been proven to be a problem. That's why there aren't people working on solving it.
I honestly don't know what the things you mentioned are, but I fail to see how physics are related to this topic. However, if you really have to use examples a better one would be that I'm saying that there weren't a lot of scientists working on curing AIDS before AIDS appeared.
The sentence I said that triggered you was "0 economists are working on this problem", referring obviously to the pay gap caused by discrimination.
You have linked to inaccurate (as per comment above) studies that study whether there is a pay gap or not, and are inconclusive.
Since the pay gap as a problem--therefore not as a hard-to-measure occurrence but as a problem caused by discrimination--has not been proven, there are 0 economist working on this problem.
It's not been proven to be an actual problem that exists, and that's why no economist is working on fixing it.