Hi Morgan,
Cookie Control is compliant with WCAGv2 level AA, so no problems there.
The dark theme offers higher visibility, with a colour contrast ratio of 21:1 (sufficient for WCAGv2 level AAA), so would recommend this setting if accessibility is a concern.
If you opt for a paid license, there's also the bar interface available, which we've found is a little easier for those dependent on screen readers to navigate.
And lastly, thanks for pointing out the error on our accessibility page. Will look into if this is an issue with extensions, or if the control keys have changed since this content has been written - I've found ctrl+alt+access key produces the expected results.
Regards,
Steve