Currently, when user cannot review questions because of insufficient reputation, the review queues icon is not displayed. This is fine. But when a user cannot review questions because they are banned, the icon is still displayed. I find such behaviour inconsistent and thus, a bug. When user cannot review questions, no matter what is the reason, the icon for review queues should not be displayed.
If you consider this as not a bug, but rather as a feature request, feel free to change the tag.
Alternatively, the appearance of this icon should changed, so that user can clearly understand that review queues are not available to him. And there should be nor red colour. The icon should draw less attention, not more. The explanation about the ban reason can be sent to the inbox, so that user can easily find it at any time later on.
There are other questions regarding review queues, but this is not a duplicate of them: