Oh for goodness sake, your DP is out of line love.
My DS was in pull ups over night until a couple of months after his 4th birthday... Before this, he showed no signs of ever wanting to wake up dry.
One night just said to me, out of nowhere, that he didn't want to wear nappies that night..
I was really nervous, but I have a safety sheet on the bed, I have a spare, I have a washing machine... so thought what the hell, don't over-rule him on this, I have to trust him, he has to make decisions for himself.. and he's never put nappies on again.
He caught me well and truly out actually, I'd just bought 2 packs of nappies and had a ton of spares from getting snowed in at my mums....
9 times out of 10 boys will get to it in their own time. I still lift DS, but probably ought not to, he is capable of getting himself up mostly... but we have had a couple of accidents.
Don't worry at all superv1xen, and tell your DP to can it too, and leave the child care to the expert!
I know 5yo that still aren't out of nappies, it's not a failing of the parent/child everytime, some DC take longer to work it all out.
FWIW, I had BW issues till I was about 8yo, very heavy sleeper, so slept through the signs. A star chart worked for me. A star chart seems to be working for DS and his poos too...