This doesn't hold water as there is plenty of specific rule coverage regarding blocking and personal fouls. This rule is to cover truly outlandish situations and should be very rarely applied.
The key words in "A player or nonplayer or person(s) not subject to the rules shall not hinder play by an unfair act
which has no specific rule coverage." is in bold. The key word in that grouping is underlined.
Since this has no specific rule coverage, despite the fact that several rules are similar in regards to blocking and personal fouls, then it can be reasonably covered by 9-9-1...even though I agree with your belief that 9-9-1 should be used sparingly.