Hello Scylla,
Is the rule already changed? See below:
You cannot use work experience in the following occupations to qualify for the CEC Program: Cooks (NOC 6322), Food Service Supervisors (NOC 6311), Administrative Officers (NOC 1221), Administrative Assistants (NOC 1241), Accounting Technicians and Bookkeepers (NOC 1311), Retail Sales Supervisors (NOC 6211). Applicants can remain in Canada throughout the application process. However, the CEC Program is also open to individuals who are no longer in Canada, provided that they submit their application within two years of leaving their job in Canada.
Source:
https://encubate.ca/canada/cec-canadian-experience/