This was an open letter to the public, I'm sure he had endless people including her that he wanted to thank, but this was his final letter to all of us.

Given what he went through and how he responded over the time, he owed no one any more but graciously gave us this final farewell.

I don't think it's particularly gracious to criticize the content.

We lost him and Daniher in the last weeks, both great people that have advanced our medical research in different ways, everyone was lucky that they were in the world.

I would bet he wrote a private letter to her.