No reason for police cert. requirement to change under C6. I would suggest reading the current guide, It has all the info you're seeking
. Police certificate(s) (as required)
You are required to provide a police certificate for each country, other than Canada, where you were present for a total of 183 days or more during the four (4) years immediately before the date of your application.
Consult
How to get a police certificate (police check) for specific and up-to-date information on how to obtain police certificates from any country.
Note: If you are unable to obtain a police certificate from any country, provide an explanation in the space provided in question 6 M on the application form.