There is, in my view, a deeper question but it is worth looking at what we know and dont know.

There is no known mechanism it could work by. That is true, but it is a statement about our knowledge and imagination, not about the existance.

How it could select one brain out of millions? Again, that is about us, in the main. I cannot understand how a bat's navigation works in the presence of many thousands of others all echolocating away. How an individual bat navigates is fine. How the bat works out its signal in the midst of all the other noise I don't understand. But they do.

There have been many hundreds of unbiased scientific attempts to detect telepathy, which have all failed (As well as many more biased attempts). So I think it is pretty clear that either thwre is something inhwritantly limiting about a scientific trial or it is something that cannot be invoked "on demand".

So for my part I am confident it does not exist, but I would be cautious in being too definite about that, because the deeper question is how do we determine knowledge. The scientific method is by far the best we have ever come up with but I do accept it may have a limit in its applicability that we dont fully understand.