Eh... personally I believe it's 6 of 1, half a dozen of another.
On the one hand, one beer an hour gets filtered out very easily and has little to no effect on blood pressure (binge drinking however, does). Even 2 an hour. How long is the period over which he's drinking? If he's slamming a 6 pack in 30-60 minutes... that's one thing. If he's drinking over the course of a night (several hours)... that's another & he wouldn't appear drunk because he's NOT drunk. 1 beer an hour wouldn't even create a buzz for most people.
Continuing on that hand... if he's being honest with his doctors (and THREE have said the same thing)... you can take that his alcohol consumption isn't medically concerning.
On the OTHER hand... "A problem is a problem when it's a problem." My dad does NOT have a drinking problem. For years he'd have 1-2 beers every night after coming home from work. At a certain point he'd come home, eat & drink, and go to bed... because the beer started making him sleepy. That created a problem in my parent's marriage, so he switched to "no beer on school nights" so that he wouldn't go straight to bed after dinner and could spend time with my mom.
So this is why I'm on the fence: The doctors aren't concerned about his drinking affecting his blood pressure... and it sounds like your *fears* of it affecting his BP are the only real problem his drinking is creating. I can understand altering a habit for a practical reason... but for an unfounded fear it seems like... overreacting? Controlling? Pandering? Not sure of the precise word. It's like putting a nightlight in a child's room. There's nothing to be afraid of in the dark... but we do it anyway. We treat their fear as real, even though it's not real. Not that it's the wrong thing to do, but it's not based in reality. It's just a kindness until they learn better. Not catering to an unfounded fear isn't being in denial... it's just not being kind.
In general patients with high blood pressure under 65 are told that 2 drinks a day are fine, and over 65 that 1 drink per day is fine. Pregnant women are also told that exercise is healthy. All 3 are true in most cases. But pregnant women on bedrest should NOT exercise. That's why we see doctors to begin with... to find out what is true in our specific case beyond "generalities". If he's been told repeatedly that his alcohol consumption is fine by medical professionals you can talk until you're blue in the face and not achieve anything.