Yes, I suspected that was the real issue - that he's reacting a bit like "well if you won't let me comfort you you can just comfort yourself!" - but it won't really help. It was really hard for my husband, as well, that transition, so I do sympathise.
Here's how it went for us. I did everything on demand, breastfed, rocked, co-slept, etc. Never tried to influence sleep at all. And mine was/is a much worse sleeper than yours.
We fed to sleep at night till eleven months, and transferred asleep. Naps, we nursed when she was tiny, then when older we paced and rocked.
One night she just didn't go to sleep on the boob, though, so we started feeding a bit earlier then doing a pace-rock thing to get her to sleep instead. Around twelve months, she started having a bottle of cow's milk last thing (we still breastfed other times), and I handed bedtime over to my husband. He would hold her on his lap, with the bottle, and then just hold her still and quiet till she fell asleep. This only worked if she couldn't see me.
Around 13/14 months this started taking longer and longer. One night, around 14+ months, it'd been an hour and he just asked her, do you want to be put in bed? And she nodded, so he did, and she went to sleep. We felt pretty stupid, actually, since I think she'd have been happier doing that for a month or so prior, but we never thought to ask and she didn't talk yet.
At 22 months she has a routine and knows it, so after dinner she goes to the stairs and points upwards "bath? bubbles?" and then when her PJs are on she asks for "bottle, mummy?" and after her songs and some requisite stalling ("pooo! mummy, I did poo"; she never has) is happy to be tucked up with her teddy and her stuffed dog and a kiss. And she has the same routine for her nap.
So really, she just grew up, and needed different things. We never influenced it, she just stopped wanting to be nursed to sleep, stopped wanting to be rocked, stopped wanting to be held, and we went with it.