No it’s not. “He said, she said” applies to two people talking about an event and there is no root source of truth.

In this case there are direct researchers and the researchers are saying their work is being misrepresented.

The researchers wrote neither of the articles.

Two people are claiming the researchers say/mean different things.

In both cases you have no access to what the researchers have actually told either.

So yes, you have two people talking about an event (their interaction/reading of some research and the researchers).

Both are telling you that the research and researchers prove their point of view.