Isn't it also similarly conceivable that if you write a predictable PRNG sequence such the outputs of Mersenne Twister you could also potentially extract patterns? Mersenne Twister is essentially as predictable as a short cycle.
However, as I pointed out, it's all pretty much moot. I've never seen anybody cough up evidence that a disk could be recovered after even a single write with merely zeroes. In fact, there was a competition and prize for a while that could be won if you could demonstrated reconstruction of a disk after even a single platter write. Nobody ever managed to claim it.