If I understand correctly, companies cannot say "we have received X (let's say 9) requests". So, is it possible for them to say "We have NOT received 8 or 10 requests"? This clearly doesn't say how many they have received but gives a clue that they might have received 9. Please ignore me if this is silly.
It's not silly but it won't work. People in the tech community typically don't see that you can't "hack the law" like it's machine or program. Judges just don't put up with it. They're adept at augmenting the law with case law that covers the loopholes.
I.e. put up a cryptographically signed and timestamped statement that you haven't received a request, then don't update it (or simply take it down) once you receive a request.
Don't some open source projects do this?