Is Cancount flawed?

The seller of a 1D Mark IIN on eBay is trashing Cancount like so:

“Let me start by saying that Cancount is bull****.* It CANNOT tell how many actuations a camera has.* I have spoke to MANY different individuals directly at Canon USA and have been told Cancount CANNOT accurately tell how many accuations are on any of their cameras. I've tried Cancount for myself, and it was way, way off.* I know about how many images I shoot, and it was telling me only 38,400, when it should have been in the 90,000 range.”

My question is this: Is Cancount as inaccurate as he says?

It rolls over at 65535 (the limit for 16-bit unsigned numbers). Use an accurate counter like my free one for 1-series cameras up to and including the Mark 2/2n's. His actual count is probably around 103.9K.

foxbat wrote in post #8271161
It rolls over at 65535 (the limit for 16-bit unsigned numbers). Use an accurate counter like my free one for 1-series cameras up to and including the Mark 2/2n's. His actual count is probably around 103.9K.

Are you saying that if Cancount is used on a 1D Mark II N with 66,535 actuations the result will be 1,000 actuations?

Ralpho wrote in post #8271967
Are you saying that if Cancount is used on a 1D Mark II N with 66,535 actuations the result will be 1,000 actuations?

yes

Thanks, dude. I appreciate your help.