Earlier quoted context omitted.
there's no need for that when samples of the virus itself are still retained by two laboratories: https://en.wikipedia.org/wiki/Smallpox_virus_retention_debat...
There are a lot more people who will soon have access to genome fabrication technology (there are already companies that do this as a service) than can break into a BSL4+ laboratory and steal one of the few remaining smallpox samples.
During the cold war, this was a polite way of saying "we know you have this capability, and guess what, so do we."
This announcement of a drug to treat smallpox is probably more about the reheating of the US/USSR cold-war again, than it is about a mission-impossible style caper with someone stealing a virus everyone already knows everything about.