S.182 for Speeding is used to give drivers a "break"; i've seen the crown reduce +40kph to S.182 which carries $110 fine and 2 demerit points
However the crown still has the prove the offense took place, by means of "stopwatch, pacing, speed-measuring device"; eye-balling it and based on the sound of the engine, is a joke. Keep in mind the onus is on the crown, this is an "absolute liability offense" which means the crown needs to be prove without reasonable doubt it took place
Officers issue tickets to get compliancy, but issuing a bogus ticket that won't hold a candle in court is very weird.
I doubt you'll get disclosure for this based on your conversation with the officer, it'll most likely get withdrawn when you go to court due to "lack of evidence".
It's also possible the officer is blowing smoke, and pulls out radar evidence or w/e; in that scenario you could plea-bargain to a municipal by-law for "disobey official sign", which doesn't carry any points and because it's not under the Highway Traffic Act, it won't go on your record and won't show on your driving abstract when your insurance company runs their check
I knew 5 guys who got nailed for 70 over, up in Haliburton, based on the officer's educated ears telling him that's how fast they were going. They all hired paralegals but the charges just seemed to go away, as if the tickets had never been submitted. Probably because they weren't.