I believe Oli's patchers are using oversampling to reduce the aliasing artifacts of digital waveforms. The advantage of oversampling is that it can be used on any waveform generator, but the amount of oversampling required may vary by waveform, and by what is an acceptable noise floor vs. performance tradeoff.
There's a couple of alternative approaches to band-limited oscillators in the gen~ examples folder, one using Discrete Summation Formula BLITs, and the other using feedback FM. Both have their strengths & weaknesses too. The feedback FM is pretty cheap, but the aliasing is reduced but still present. The DSF BLIT is more involved, but is certainly cleaner.
I started working on a minBLEP based oscillator example, but it's not working yet.