Most of this is ridiculous, and some is dangerous nonsense.
As far as pregnancy, I would say that people who have body issues of other kinds will still want to become pregnant, so I don't see that it would be different with transmen. I've known women who had anorexia for example who desperately wanted to become mothers but struggled with the weight gain of pregnancy.
I don't think helping people disassociate in thee kinds of circumstances is particularly kind of helpful, mind you.
It's also true that many pregnancies are accidental and many people don't consider abortion to be a neutral option for dealing with that, so the idea that any transman in that situation would have an abortion if possible seems like a tremendous assumption.