If such a trivial test really did[1] filter out many candidates (beyond the technical limitation of the test that some client devices will render the =, as mentioned by users leveraging reader mode), I wonder if there is a greater observation we could draw from it. Personally I would assume 100% of programmers could very easily answer the question in seconds, and if people really were copy/pasting to an AI tool[2], I would assume they are so jaded and exhausted of clever reviews, nine round hiring funnels, leetcode, blackboard code, and so on, that it's just another of countless applications they've made and they just don't care anymore.

[1] Yeah, I'm super cynical about stories like this, and know that many if not most are just invented shower thoughts manifested into a fictional reality.

[2] Alternately they're pasting to a normal editor -- even notepad -- for a more coherent programming font, where again the = appears.