Please read page 23. I have quoted the relevant part, it is not what you quoted above, and neither is it any where close to what you stated:
Cbsa coordinates the security screening process which involves several agencies including csis. Csis completes their investigation and sends the report to cbsa.
vs.
"The Security Screening Program is responsible for the security screening of foreign nationals who have been referred to the CBSA by an IRCC visa officer abroad or in Canada, who are seeking to come to Canada as a permanent resident, temporary resident (e.g., visitor) or refugee, or are already in Canada and seeking to remain as a temporary or permanent resident."
The question is that all files will go through CSIS, but when will they go to CBSA, and what is the procedure, and the legislative or regulatory mandate.