Those were points selected by the author Michelle Cottle. It is by no means the complete truth of the matter.
So you have evidence that the campaign thinks sexism played a role?
Were sexism so big a factor in Clinton's defeat, would it have not loomed equally large before the contests began, depriving her of her role as frontrunner and presumptive nominee?
One would assume. What's interesting is that if I asked this same person if racism were responsible for particular Obama defeats and problems with certain demographics I'd almost be certainly told no.