Presidential fitness is a serious matter, and we in the media are not doing the American public any favors by speculating about what is going on with President Joe Biden, just as the White House is not doing us any favors by obfuscating the truth.
We do know that he currently has COVID-19, with mild upper respiratory symptoms so far and his chances of a severe course markedly reduced since he is taking Paxlovid. On the other hand, recurrent COVID does increase your risk of post-COVID problems, including worsening cognition.