Thanks SNIPERBBB and Raymond.
The last few posts have been very informative.
It appears that the NFHS has intentionally and deliberately wiped clean any casebook play referencing offensive goaltending on a free throw.
So getting rid of a technical foul for such action was not an unintended consequence, or an oversight, but an intentional and deliberate decision.
That's probably enough confirmation for me.
It’s really true, there really is no longer any such action as offensive goaltending, for a field goal try, a pass, or a free throw attempt.
At least we found three past casebook plays, that while worded slightly different, did tell us that the NFHS did, at one time, consider such a situation, it's not like counting angels dancing on the head of a pin.
The recent IAABO "word salad" clarification regarding free throw goaltending is still confusing me, but I'm now pretty sure that there is, indeed, no longer any offensive goaltending.