I don't think Rut's saying you NEVER call a foul, but only that there are cases where a no-call might be okay.
There are several degrees of "hitting the floor", and we need to witness it before making a call, I think.
I had a play at this tournament recently:
A1 on a fast break, goes up for layup, and B1, a taller player, gets a piece of it and blocks it. I was ready to no-call it until B1's shoulder bumped A1 on the way down, causing him to hit the "stanchion" (

there, I used the word - are you happy Camron, Juulie, Chuck, and Bob?).
I remember it seeming like an eternity between the ball getting blocked, and the defender hitting the shooter. No one on the floor complained, no coaches complained.
And, for what it's worth (which is not much), the crowd let out a huge "OHHHHH" in applause after the block - but did not express any disapproval after I called the foul.
Bottom line here is this is one of those ones you just gotta see.