Up to him. I did something similar with weed after not smoking for about 8 years, 20+ years ago. I was curious what I'd think of it after all that time, so I got high, and I hated every moment of being stoned. I have no interest in going there with alcohol, since I know what happened with weed and since alcohol was far more destructive to my life and far more difficult for me to quit, but I can understand someone doing that and not considering it a "relapse".