This doesn't replicate, AFAICS. The one in Phase I by Imperial College is instead self-replicating.
See the section on COVID-19 near the end.
AFAICS, this is not BNT162b2, which is the one that we are talking about. There are 3 other candidates, one of them is the self-amplifying one.
The paper seems to imply maybe not? https://www.sciencedirect.com/science/article/pii/S187962572...