To further illustrate why the penalty statement is so important relative to PSK, one needs to look at the penalty for roughing/running into the kicker in 9-1-16. "15 yards from the previous spot, plus automatic first down...."
If it didn't say "from the previous spot," then RRK/RNK would be a PSK foul the way that the PSK enforcement rule is written today per 10-2-3-b. Those of us that have been using NCAA rules for more than 2 years will remember when Rogers removed the line about the foul having to be more than 3 yards beyond the line of scrimmage. Now the foul by B just has to be during the kick (among the other things listed in 10-2-3-b). However you can't have roughing the kicker without a kicker, and you can't have a kicker without a legal kick. So therefore, if the penalty for roughing/running into didn't specifically state "from the previous spot" you would HAVE to enforce those fouls from the end of the kick if B ended up with the ball because the RRK/RNK would have to have occurred during the kick.