There's a risk of echos of Theranos here. A paper apparently describing this ultrasound approach has been uploaded to arXiv [0]. If so, the resolution demonstrated is nowhere near sufficient to detect small changes to anatomy, let alone monitor them over time. Future developments could obviously improve on that.
one of the lead paper authors (jinhua xu) works at midjourney, appears in the video, and comments specifically on how the midjourney approach is the next, significantly better-funded iteration of the paper approach
[0] “Whole Cross-Sectional Human Ultrasound Tomography” https://arxiv.org/pdf/2307.00110