This is a tautology, and in no way addresses the point that absolutely nothing is learned about the efficacy of one of the drugs he took, by looking at a single data point.

Unfortunately, it really isn't. It's not common, but some people do get normally fatal cancers and recovery without treatment.

If you happen to test a new cancer drug on a case like that, you'd walk away thinking you had something when the drug really did nothing.

For something like Covid where the impact can range from nothing to death, a single case doesn't really tell you much about a treatment.

He wasn't part of a controlled scientific study, so it wasn't really a useful data point from a scientific standpoint.

Okay, here is the data point: If you get treated by some of the best doctors your country has to offer in an absolute state of the art facility in record time (i.e. almost no delay between outbreak of covid and detection) the given drug cocktail was effective (if we assume they don't lie about Trumps health. In the footage on his return to the white house he didn't look healthy at all).

I'd argue that this certainly is a data point. Just not a very useful one.