Where did you get any info that indicates that?
I have an R80496 and it's NOT rebuilt. It's a list number 80496 carb.
The 84010 is the part/list number of the carb and it's coincidental that the 4010 also matches your model style. The next on the list is also a 4010 model, yet has 84011 which is a 750 cfm. The breakdown you posted can't be correct.