[nvm0n2]

> 8% sounds a rounding error and probably within the error margins.

It is not.

Erm yes it is ... from the study:

> In adjusted analyses, we estimated that any vaccination ... reduced an index case’s risk of transmitting infection by 22% (6–36%)

CI is much wider than 8pp and the estimated absolute transmission risk CIs actually overlap at 31%. So the study results are consistent with there being no actual difference, also.

If this is the best evidence of a difference in transmission it's not very good.

Also this is Omicron which hardly matters. The justification was the earlier variants.