I think the fear of asking for help thing is more common than you might think. Thinking back I probably did have PND, but was wary of admitting to needing help because as a single mother, I did worry that people might feel that my child would be better off with someone else (this was probably projection due to the fact that the PND was making me feel like my child would be better off with someone else).
But yes, a very one-sided account by someone who does sound like she's still not in that good a place.
However, having said that, motherhood is bloody tough. I used to joke that I wanted a t-shirt that said "This is not PND, this is a rational reaction to intolerable circumstances." Sleep deprivation, a colicky baby who screamed and had a tongue tie so couldn't latch - the first three months were, objectively speaking as well as when viewed through the fog of PND, hell on wheels. And even now, with all the enormous rewards having a child brings, I'm painfully aware of how precarious it can all be - my health has not been good this winter, and coping with the relentless, bone-numbing exhaustion this brings with no respite at all because you come second to your child: motherhood is enormously tough, comes with no rest, comes with no opt-out button, no option to change jobs - it is an occupation unlike any other.
So although I found the piece depressing and one-sided, there were elements of truth in it.