I went through it like 10 times trying to trigger the epilogue on a modded save. Nothing's been changed. What they did in Patch 5 was make it so the companions in your active party get priority in speaking up at the docks. So now it's more probable to get his whole "oh I can still walk in the sun, no I can't" thing.
I also found out that sometimes he's the one who will offer to go celebrate, which makes his ending then feel even worse.
