What I've said is that the Pfizer and Moderna vaccines, based on the studies that have been emerging after the statement, seem to be efficacious against the B.1.1.7. We don't have much data about the South African strain variant yet. Against the U.K. variant, it seems to be fine. Against the South African variant, it seems it still remains to be looked at.
On February 19th, 2021. See this statement in context.