Covid, leaky vaccines

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Can someone explain leaky vaccines to me?
https://www.healthline.com/health-news/leaky-vaccines-can-produce-stronger-versions-of-viruses-072715

If understand this correctly, leaky vaccines create populations that is entirely dependent on vaccine since they promote spread of "stronger" mutations.

Covid vaccines are leaky.
Even though outside of risk group(which I think should be vaccinated) covid is not deadly.
There is strong push for mandatory vaccination for all.

So, won't it create population strongly dependant on yearly/quarterly vaccination?
As each new variant will be "stronger" due to leaky vaccination?
Or am I missing something.