Look at the latest version of the Document Checklist (04/2023) that must also be uploaded.Actually it says " If you’re applying to renew your PR card, provide a photo of your destroyed PR card." Screenshot attached, taken from https://www.canada.ca/en/immigration-refugees-citizenship/services/immigrate-canada/apply-online-pr-card.html
It shows, this:
In addition to the above, include the following documents if you are:
Applying for a permanent resident card (PR card):
Your PR card
If you are applying to renew your PR card, provide a copy of your current card. If you are applying to replace your PR card, provide:
● Paper application: Your original physical PR card.
● Online application: A photo of your destroyed PR card.
If you lost your PR card include a copy of a police report or incident number, if applicable.
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So, one could deduce that it is an error on IRCC's part to not properly explain this, here:
https://www.canada.ca/en/immigration-refugees-citizenship/services/immigrate-canada/apply-online-pr-card.html
While it is clear that a person applying to renew their current card is, in fact, applying to `replace' their card...it is clearly different from those that have lost, damaged or had their cards stolen. I suggest, again, to NOT to destroy your current card.