Ffs! Ars Technica is pretty much unusable now! Not only does their cookie consent prompt reload every time you deselect what you're (apparently but not really) allowed to deselect, effectively looking you out unless you accept all cookies, check out how many fucking companies they were gonna share your data with just from the mandatory ones! 🤬
It's better, it doesn't accept any, it just deletes the elements that make up the UI. It's not the government's fault that Ars intentionally made their website unusable. They could just follow the intent of the law and not use cookies at all.
By default it's not enabled in uBlock Origin. Go to the filter list settings and enable the appropriate Annoyances filters for Cookie Notices (or just enable all the Annoyances filters)