They are, in a roundabout way. Hop into your uBlock Origin settings and enable the Cookie Banners and Annoyances filters. The modal gets silently nuked in the background and you can carry on with your browsing. Since you never consented, this ought to be functionally the same as Declining the banner.
The Kill Sticky bookmark works similarly, for crappy browsers that don't support uBlock Origin (eg iOS, Chrome for Android): https://www.smokingonabike.com/2024/01/20/take-back-your-web...
(Remember when web browsers used to treat their users first and implemented things like Popup Blocking, enabled by default? I miss those days.)