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I know Bill Spight doesn't think of this move as a probe, rather as an opening in its own right. I'm inclined to follow, but I don't quite know how to call this page instead.
For many this is the first example that comes to mind when talking about probes, I don't know whether this is good or bad, but we should acknowledge this. What I always wondered is why is Black giving White the choice to decide the kind of game that will happen here? Is Black when not played by a professional really equally comfortable with both results, i.e. the one where you have the urge to jump in the corner soon after the large knights jump and the whole different game resulting from it? Imho this is one of those "whole board openings" that is parroted by amateurs usually without the means to follow up on the basic ideas that makes this meaningful for professionals. I would make it less prominent on the main page on probes (4 diagrams now), but I don't see the point of not calling it a probe.
The page is not about the attach and extend joseki, is it? Try clicking on the existing link in the page and see where it takes you. The title should refer to the 3-4 Point High Approach Inside Contact.
BTW, I would say that the approach move against the 4-4 stone is a classic example of a "probe", although in the midst of what is now the main line of the joseki. I can't understand why Bill or anyone else would object to it.
Bill: I agree that the joseki is misnamed. :)
As for the probe, I do not particularly object to calling the approach move a probe, if that is how you want to think about it. What I have said is that the tenuki is normal in this joseki at that point. It is hardly unusual in the opening to base your moves on your opponent's moves. :)
Nope, I think that probe describes the given play better than tenuki. The majority follow ups clearly show that White 'probes' Black's intentions before finishing the original corner. "Tenuki! We don't need no stinking Tenuki!"