Goddammit I just typed a long response and accidentally deleted it.

In summation:

Yes and No this question is sexist. It is sexist in this particular study because the bias lies in the data itself. Not that the data is biased towards the truth, but the goal of the research was to find differences or at least ascertain them. These differences are not just in "white matter connection strength" but, as the article itself begins to posit, in the translation of this to actual inferences and the story that this data contributes to. There are many similar studies where the data was not found to be different, but they "found" it this time. The curve fits for the scientists and the audience with respect to the idea that even you yourself already brought to the table, that "as should be expected", there were differences present. I do not think that they intentionally forged any data at all, other than the absolutely typical deletion of outliers, etc., and it may show exactly what they say, however, this does not make it true.

Without elaborating as much as I was previously, from a genetic, biological and developmental standpoint with our current knowledge, the differences most likely do not exist, and more so, not with respect to a biological woman and a biological man being innately different in brain function from one another when removed from exterior influences. This is not considered in this study, (so far as we can tell since this isn't completely published) therefore this study doesn't matter, as it does not present a reductionist model with the necessary caveats, but literally men and women in our society.

The philosophy of science as an deterministic endgame works wonders for basic chemistry, molecular biology, physics etc., but this determinism deteriorates rather quickly when it exposes itself to seemingly "empirical" viewpoint on a multi-faceted issue wherein the data this analysis is driven by is massive and stems from correlation, as well as being tangential and abstracted to the dialogue it contributes to.

Science is not just numbers, they contain no truth in themselves. Science tells a story. What the hell kind of story is it trying to tell here?