Kelvin, the section of the rule book I quoted is from the part of Rule 10 devoted to personal fouls. The rules there are all of the form "A player shall not..." so I read the statement "Screeners shall be permitted to line up parallel to a boundary line and next to each other without locking arms..." as indicating that locking arms *is* a personal foul (just as all of the other prohibited behaviors listed there are personal fouls).
So far as I can tell, locking arms isn't mentioned anywhere else in the NCAA rules.
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