that is the pc garbage.. researchers throw into all studies which run contrary to the narrative. They do it so they can keep their jobs or get published past the PC barrier. Its standard boilerplate shit.
They go back and find a few observation studies which were invalidated after the 2nd and third waves happened.
So in other words you disagree with what is in the study. If this one section is not correct then by extension the rest of the study must not be valid either.