Not only does Safari allow for 3rd-party adblock extensions that are pretty good, there are iOS browsers available, like iCab Mobile[0] for instance, that allow for extremely fine-grained, granular and tweakable ad-blocking, filtering, domain-blocking, and CSS and javascript rules - all of which can be user-edited and refined to fit exactly the user's own requirements.
There are always so many comments like the above in these threads: often characterized by people banging on iOS because it "can't be customized the way I want it after I paid so much for my iPhone". But these seem to be just standard consumer-mindset complaining from users that don't even have the intellectual curiosity to investigate whether there's actually anything already available that solves their imagined problem, or even try to fix it themselves - just as the article says.
[0] https://apps.apple.com/us/app/icab-mobile-web-browser/id3081...