[mordocai]

We'd need an answer from gitlab, but that statement was there with the old infrastructure for shared runners.

It is possible that this issue is fixed with the new ones?

[sytse]

You're correct, we fixed this issue, the new warning will be: "Shared runners execute code of different projects on the same Runner unless you configure GitLab Runner Autoscale with MaxBuilds 1 (which it is on GitLab.com)."