So... I went to service ontario.. The agent said "Ignore the policy and the form listing: you have to let us know within 30 days of your change in citizenship".. She saw the "Wat!" expression on my face and updated my citizenship status.
I don't know what to say. I would still update it to be on the safer side. But upto y'all!
And, all the best!
Sure, update it.
But the question I'd ask: "or what? what difference does it make?"
The truth is (my guess): they have a policy that says one must update them, and that policy is intended to catch ANY case where a recipient of services (eg healthcare) loses eligibility. You definitely DO have to advise them if you lose your PR status (because it's revoked) and do not obtain any other status that entitles you to coverage.
But when you lose PR status and become a citizen*: you're still entitled. There's no issue. You can't be accused of fraud.
So sure, you should advise them you became a citizen. But it's not such a big deal.
*Yes, when you become a citizen, you lose your PR status. Most of us would not think of that as a bad thing, but it's still what happens.