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Short answer is it isn't a myth, just rare.
Long answer is "Capital one will periodically review your account for eligibility of offers like unsecured credit limit increases. We, at capital one, have no knowledge of what this review process entails, nor what you can do to make yourself eligible, because we never know dfq is going on"
lol
I had a secured Cap1 and received an auto CLI at around the 7th month mark.
I started with a $300 deposit and received a CL of $551.
The auto CLI was $300 and bumped me up to $851 total Credit Limit
Usage was pretty heavy and never PIF. Always had a balance around $200 on it