If it's just the spike protein encapsulated in a lipid nanoparticule (for isolation and transportation?), that looks like something not creative and quite established for people in the field of genetic material transport.
My layperson's understanding is that the actual spike protein and/or mRNA are modified from the natural versions. Both for stabilization (if either falls apart quickly, they're of no use) and for response optimization.
So somewhat like how a fishing fly differs from the insect it represents.
