I think you really need to read the letter. Read every sentence and think about what it is communicating. And events contemporaneous with the letter.
And remember, Lindberg, at one point, thought Hitler was wonderful for Germany. So did a lot of prominent Americans and Europeans. AS events unfolded, they changed their opinion.
You need to take this letter in context and see not only what it is saying, but what it is NOT saying. Some of the readers here are incorrectly inferring things that are not said, nor implied.
Never did he use phrases like “universal coverage” or anything like that.