In writing, I usually find that it's clearer to talk about things that are than things that are not. Now remember I said "usually."
Tax instructions used to be bad that way. "If line 48 is not less than $30,000, go to Section 4, unless AGI is no greater than $50,000."

The wording, though, is precise. To re-word it (keeping the same meaning) you would need:
"If line 48 is more than $29,999.99, go to Section 4, unless AGI is less than $50,000.01."
As a retired civil servant (UK) I prefer the original formulation.