What i think is they r not asking u pof which include fdr’s n bank balance etc. but u need to provide evidence of a valid job or job offer which requires pay stubs , bank statements showing that u get salary every month, job letter showing ur noc codes n responsibility and T4’s is the major proof of an income generated...as per the link you dont require PoF CEC, if you have submitted it is also OK
Hope i clear my point of view..!