Interesting quote, but it's not true unless the OB is in the middle of the table. If you've got an object ball an inch or two off the rail, the tightness of the pocket changes where you should aim, in my opinion. I used to play at two pool halls, on with fairly forgiving GCs, and another with gruesomely tight diamonds with cupped pocket facings. On the GCs, the most consistent way I found to pocket a shot down the rail is to aim for the very end of the rail you're adjacent to. If you overcut a little, you go straight in the pocket off the facing, and if you undercut a little, you'd hit the rail a little further up, but unless you hit it hard, you're in good shape. On the Diamonds, the only way to pocket the shot it to hit the OB directly into the far pocket facing, not too hard, without so much as grazing the rail on the way. Same shot, different pockets, different optimal point of aim.
On a more relevant-to-the-thread note, you have to consider the pocket tightness doesn't just affect potting, it affects position. Firstly, you can't cheat tight pockets as much. More importantly, there are some tables where the pockets won't accept a firm shot from certain angles. Sometimes you have to baby the pockets, and it severely limits your positional options, and even your pattern play. On a tight table, I'll often try to play a few shots toward a safe, since a straight-forward run out pattern is really unavailable because it requires hitting the shots hard or juicing the cue ball.
-Andrew