Which is itself completely irrelevant because support structures or lack thereof don't have anything to do with PPD in any way. Plenty of people with amazing support in their family and community end up with crippling PPD. Plenty of people with zero support don't have the slightest bit of PPD. It's irrelevant.
How is it completely irrelevant? I think you might not know as much as what you're talking about. And/or be out of date. I'm normally don't reply to posts that contain petulant dismissal and minimization of others.
Knowing how there is a much larger silent group who is reading and might disagree with you, or how your words will actually do harm to deny a mother what she may be going through.
It's up to you, but I hope you read the below with an open mind and eyes.
Isolation in a pandemic CAN make PPD worse.
The rates of PPD during the pandemic WERE much higher, and from what the data is saying more intense.
Imagine: Becoming a mother alone in a hospital room, without a single woman figure in the family who exists and would have been present otherwise is very easily a magnifier and amplifier of any conditions. Some mothers had to enter the hospital for weeks before birth alone from complications.
No visitors allowed, or only one. No support people allowed. Hospitals also had shut down most of the pre-natal and ante-partum programs and check-ins with dieticians, other parents to be, etc.
It was pretty much solitary confinement, and dismissal of it for those parents who went through it is pretty surprising since you seem to be an authority on what does or doesn't make PPD symptoms or experiences worse. It just kind of shows how out of touch your position might actually be.
So, onto the logical proof of explaining something that will only exist once science has studied it for your logical brain.
1) "Pandemic isolation is leading to more postpartum depression, anxiety. Everything that we tell postpartum women to do, like connect to other people, get out of the house, establish a routine, they can’t do that.”
2) "A third of new moms had postpartum depression during early COVID.
People who delivered babies during the pandemic also reported more distress and anxiety. ... One in three new people who had babies in the beginning of the pandemic experienced postpartum depression – potentially triple pre-pandemic levels – while one in five had major depressive symptoms, according to research led by the University of Michigan School of Nursing and Michigan Medicine."
3) "New moms, experts worry about postpartum depression during COVID-19 as services cut back Many in-person services now being offered by phone, video or have been cancelled altogether"
5) "We believe the present study to be the first to demonstrate that fewer supportive persons during pregnancy is a predictor for postpartum depression. This finding points to the benefits of early intervention to increase the number of support providers for pregnant women19."
I hope this helps with undertaking a search yourself to learn more about PPD.
As an aside, it's questionable if there's a reason you feel it's acceptable to harshly dismissing the words of strangers as harshly as you might with your own inner dialogue? The world's eyes and ears are not a toilet for you.
As for support structures having nothing to do with PPD, I can only speak to what I've witnessed and what the doctors in our lives have pointed out.
Since you weren't there, and it might not exist for you unless you can understand it, it's pretty easy to search for topics on the internet these days.