Is a "non-admission" a "maybe"?
Not admitted usually means you can't say categorically either way - sometimes where the knowledge is exclusively others outside the Defendant. Rather than maybe, it's safer to interpret as 'probably not, we can't say for sure, for you to prove'. But yes 'maybe' is one way of looking at it.
So for example, if a Claimant pleads in a personal injury case they have suffered pain, suffering, loss and damage as a result of an accident, very often the pleading in response will be 'not admitted, if there was such damage (Which is not admitted), it was not caused by the Defendant'.
this is because unless you can say categorically there was no damage (for example if the case is the Claimant wasn't even there), whether a Claimant in fact suffered pain or suffering is exclusively within their knowledge so a Defendant can't really deny it because they don't know.
On the other hand, the Defendant certainly won't admit that the Claimant has suffered pain and suffering. If asked, they aren't going to say 'maybe' , they'd say 'we doubt it but you prove it'.