I have not heard of this being an effective way to produce a buttock enlargement, nor does it make any sense that it should.
The two most commonly used procedures are (1) insertion of a buttock implant and (2) fat injections. These may be done together and are even more effective in producing the desired results when they're combined with liposuction contouring around the buttocks. The maximum result, then, is enlargement (via one or both methods) ADD removal of some of the surrounding fat.
I hope that this helps, and good luck,