Where's the 30B-in-6GB claim? ^FGB in your GH link finds [0] which is neither by jart nor by ggerganov but by another user who promptly gets told to look at [1] where Justine denies that claim.
These all postdate the discussions that I linked (from March 31st). By April 1st JT themselves seems to have stopped making/boosting the claim about low memory usage.