That's correct. I'm not saying bolts aren't stronger - I'm just saying in two jeeps with two seasons of overlanding apiece, going over deep mountain washouts and downed trees where the front is fully flexed regularly, I haven't had a problem. Ultrablack is really, really strong if you let it cure fully. I've owned 3 TJ's total - the first I used made to order bumpstops that had self tapping bolts - drilled the front perches. The last two I've gotten lazy and just used the ultrablack and hockey pucks. None of them have detached in use. That doesn't mean they never will, but I'm not sweating it. I keep a few in my trail kit as spares.
If you're installing a lift and doing a full flex test on jackstands with the springs already out - might as well drill them. If you didn't - you can jack up the front of the jeep, clean off the perch with brake-kleen and a rag, and smear on the ultra black (saving you removal of the springs.) The puck fits in between the coil windings. One is the better/proper solution, one works just fine - at least in my experience. YMMV.