I should have referred to it as FET or transistor power I suppose. Correct, no high-voltage polarization bias is required with pre-polarized electrets, so running the capsules off a lower supply voltage won't affect capsule polarization the way it does with an externally polarized capsule. It's simply the power requirements of the buffer/amplification circuitry which needs to be met, and those requirements vary depending on the specifications of that circuitry, hence the 5V, 48V and 130V DPA variants.
Most users are familiar with pre-polarized eletrets in the form miniature microphones, most often but not always with a non-balanced output. Use of electrets throughout the entire high-quality, regular-sized, balanced-output capsule range is unique to DPA as far as I'm aware. Historically when other manufacturer's have used pre-polarized capsules in their non-miniature lines, it's been restricted to their lower-quality microphone lines. I've long thought about the implications of high quality DPA capsules being pre-polarized with regards to alternate non-phantom powering options, and this is the first I've seen of them leveraging that particular advantage.