I genuinely don't get why people are so bloody desperate to call it PND in men. What's the point? How does anyone benefit from saying new dads with depression have PND? Does it help determine prognosis? Guide treatment? No. It can't, because all the decades of research and data out there on PND are on people with female physiology who have just gone through the enormous hormonal, physiological, anatomical, psychological, and social turmoil of giving birth, and whose bodies, brains, and lifestyles are now deeply impacted by those circumstances.
What the hell use is it to apply all those years of research and expertise and data to someone whose condition is profoundly different? There are similarities and parallels, yeah, like the whole "brand new human you're totally responsible for keeping alive" thing and everything that goes with that, but FFS. It's of no use to apply a label to a whole new group in a superficially similar circumstances but who are in other ways very different.
I'd back a specific diagnosis and specific research for people in this circumstance, and for any applicable lessons from treatment of PND to be carried over, but men can't appropriate PND. It doesn't help us and it doesn't help them either.