Tools like Pangram can detect whether text is written by AI or a human with a probability non-negligibly different from 0.5. Therefore, the Turing test in its strictest form (that there must not exist such a distinguisher) has not been passed.

Well, the Turing test involved a _human_ evaluating whether it was talking to a machine or not. In this case, another AI is necessary, which means, in its strict form, the Turing test has indeed been beaten.