A clarification is not a change - this is nothing new. I guess NFHS felt that a lot of officials did not understand the rule (and I've worked with a few of them who did not). When calling an off-ball foul, it's generally a good idea to take a peek at where the ball is before sounding the whistle. A slow whistle on on off-ball call is not a bad thing.
For example, A2 and B2 are in the post and you decide to call a push on B2. A quick look to notice that A1 is in the motion of shooting and you can wait until the ball is in the air before you blow your whistle which will make it easier on everyone. Bucket is good and the foul is on B2. Team A gets the ball out of bounds if we're not in bonus yet.
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