I agree. Many people try to apply creative interpretations of the word drug to exclude substances they don't want to have a negative stigma.
But the way I see it that's approaching it from the wrong angle. The problem is the stigma people have towards the word drug. That's what should change. Not keeping it but trying to excuse arbitrary substances from the category.
Alcohol is a drug. It's a powerful, dependence inducing hard drug at that. It's people's attitudes towards drugs that should change IMO. Not what substances are considered drugs.