This is the same cardiologist who was of the opinion that your condition of being severe AS, with symptoms, was not urgent and could wait several months to see you, correct?
Please get a second opinion. Those with BAV are better going with tissue valve? I would recommend asking him for the medical literature on that. I can tell you that, almost certainly, it does not exist. Don't take my word for it, get a second opinion. If he can provide evidence in the medical literature that BAV patients do better when they get a tissue valve, vs mechanical, I will gladly stand corrected.
If he gave a darn, he would have seen you when your echo showed severe AS, along with the severe symptoms which you described. He blew it off and waited months to see you. Now he makes this claim that tissue is better for patients who have BAV? Think about it. When you get surgery, they cut out your BAV valve. I can see no reason why being BAV would tilt the scales for a person to get a tissue valve or mechanical valve. Age is the primary driver in every guideline in the world with respect to valve choice. As I noted above, if he can provide data to support this, I would be happy to be corrected. Again, please get a second opinion. Per some of your previous posts, you already have initiated getting that second opinion, so best of luck with that.