No fucking way Beethoven was deaf.

Not at first. His music is mathematically correct.

I used to listen to a lot of Beethoven. I don’t recognize this. And doesn’t seem like him.

Maybe. Music is vibration. No visual vision needed.

I can think in intervals. He wasn't deaf his whole life. He just had quite the noggin.

He wasn’t completely deaf. Plus, had the luxury of hearing for most of his life until later.

If you played a lot of music, you can watch that video without sound and still hear it.

No, he wasn't deaf until the end of his life. His hearing declined.

This is not Beethoven

Makes for a great sales "pitch", pun intended! Yeah, I was a musician for decades and remember classes on the greats and I always knew it couldn't be that way to create such pieces as he did with no Auditory senses which is what makes the experience of music.