The link given is to apply for a new citizenship certificate. Hence that's what timeline is shown, too.
If you applied under the correction procedure and followed instructions here:
https://www.cic.gc.ca/English/helpcentre/answer.asp?qnum=598&top=5
Including marking, "urgent", it MIGHT be faster. But I don't believe they show a timeline and so it's anyone's guess - it's probably a rare enough thing that they just don't do timelines. Personally I'd guess that nothign happens in less than 3-4 months from them these days.
If you wish to get an answer and at least some acknolwedgement, you might try through your MP. (I did this through MP for citizenship for a minor and at least got confirmation that they "don't always provide acknowledgement" at the stage I was concerned about; don't know if it helped but we did get the certificate 3-4 weeks later. My impression is it might have dislodged it from whatever dark recess it had been sitting in.
My other impression is that the actual printing and mailroom operations there are a serious bottleneck.