Not sure, but it seems that if one was going to say high fat causes t2 because the mice ate high fat and they got fat and developed t2... One would have to indicate fairly what the rest of the macros were. A standard american diet leading to obecity and t2 is high in fat too, but also high in refined carbohydrates. Lchf diet, for example is high in fat (obviously), but takes out much of the carbohydrates... That would not be the same diet, would it? I don't know what the effect on the fgf1 response would be, but as scientists, they can't pick and choose what parts of a research project they want to disclose, not ethically anyhow. You could find three sets of lab rats, feed one a lchf diet, feed one a lclf diet, and feed one a SAD diet. Now, all is fine, but if you happen to mention that one of the groups also were given arsenic in their water, and that group died. Well, don't go blaming the diet. So if you say we gave them loads of fat (but "forget" to disclose the carb/protein levels) then it isn't the whole picture.
Not being adversarial, just pointing out that the link did not give full disclosure of all the elements in the "scientific" comparison.