> That's quite a different claim to "it permanently reduces your body's ability to learn how to counter different parts of other versions of COVID".

Here the argument is that, when the antibodies “learned” from the vaccine have a low, but not nil, effectiveness, then the immune system of a vaccinated person would continue producing only the same antibodies. A person with natural immunity would instead be able to modulate the immune response and use the most effective among the many antibodies that they can produce.

> This is a very different argument that natural infection gives more effective immunity than vaccination, and the empirical evidence does not seem to agree.

There is some evidence that natural immunity lasts longer, although it is not settled yet.