This is pure speculation, and he really doesn't know what he's talking about:

"The main problem is that DXO also contains an amine, and that amine can react during the process. So the first step would be to temporarily protect the amine so that it doesn’t interfere."

Anyone who's taken introductory org chem knows better than this. That's a tertiary amine, so you're not going to be protecting it. Not that the compound can't be made -- it probably has been already. I'd check on Reaxys but I don't really want a morphinan in my search history...