See the press release.
Looking at these reminds me of images my mind created when I first read Robert Bradbury's paper on protein-based assembly of nanoscale parts.
Does this advance mean that MNT is imminent or inevitable? Not in the slightest. Humans were making complex structures out of macroscale metallic objects about 2,000 years ago, but we still haven't created a self-replicating machine. Self-replicating nanoscale manipulators would be necessary to make MNT work, even if those manipulators only self-replicated as a large ensemble (like a blacksmith's tools can self-replicate in aggregate and with human help).