It's probably more feasible to require them to be disclosed after a period of time
Gag orders don't force you to state wrong facts about your products in the first place.
What if they do?
Then it is not a gag order. A gag order means "don't say anything about X" and is not concerned with what you might or might not say instead.
Look up "warrant canary". IANAL, but my understanding is that you can be secretly compelled to not speak, but you cannot be legally compelled to actively tell a lie -- the Wikipedia page agrees with my interpretation. So, you can just publish "I am not subject to a gag order" every day until you are subject to one.