I believe that you need to inform users about the use of strictly necessary cookies as well. You just don't have to ask for consent before adding them.
> While it is not required to obtain consent for these cookies, what they do and why they are necessary should be explained to the user.
There's nothing about a cookie banner in GDPR, it's just the most convenient (and, often, laziest) solution to the question of how to confidently say you've told users something.
https://gdpr.eu/cookies/:
> While it is not required to obtain consent for these cookies, what they do and why they are necessary should be explained to the user.
There's nothing about a cookie banner in GDPR, it's just the most convenient (and, often, laziest) solution to the question of how to confidently say you've told users something.