I don't understand this advice. The correct answer is written on the IRCC website. In black and white. IRCC have gone to lengths to show that this answer is not correct:
http://www.cic.gc.ca/english/resources/tools/perm/express/intake-complete.asp
Quote:
Document requirements
The applicant should provide an official letter(s) from one or more financial institutions that lists
all current bank and investment accounts as well as outstanding debts, such as credit card debts and loans.
This isn't ambiguous in the slightest, it says you must disclose everything. I've clarified this myself with IRCC on the phone today: They don't care about your net worth (i.e. if you have debts they're only a problem if you borrowed that money to show POF) but they clearly ask you to provide information about ALL bank accounts and ALL debts you have to ensure that you have not borrowed them for the purpose of providing POF.
Whether or not IRCC will find out about other bank accounts and loans is perhaps another matter, but if you do fail to disclose certain accounts and IRCC subsequently finds out about them then don't come complaining that you've received a five year ban from Canada for misrepresentation.
Failure to disclose something which could be viewed in a negative light by IRCC (something like another bank account showing loan repayments coming from it seems a good example) seems to me like a perfect reason to reject someone and then ban them for misrepresentation.