If he's still drinking any amount, he's in active addiction and not recovery.
I think I would do what is best for you at this point unicorn with the understanding
he is choosing to drink and not engage the family--the reduction in amount will slowly creep up--
he's still an addict but temporarily moderating to get you off his back is my best guess.
(I did this too for awhile with my spouse)
I think I wouldn't like the deal you are getting either--what kind boundary are you willing to set and enforce at this point?
A threat you back off of is worse than doing nothing, so be sure you are ready to act. . .