Colorblind feature preview flag does nothing

I recently saw the feature preview flag for colorblind themes and enabled it to see nothing in my theme’s appearance had changed.

I then went to /settings/appearance and found the colorblind themes were listed, selecting one worked as expected.

I then switched back to the dark theme and disabled the colorblind feature preview flag, and visited /settings/appearance again to see the colorblind themes were still listed.

It appears the feature preview flag does not do anything and would be good to remove since it was actually confusing in my case (I wrongly expected to have a colorblind theme enabled once I toggled it on).