This is basically a Marxist criticism: the owner class of AI systems take advantage of the proletariat class "AI raters." The classes are not equal in renumeration so this is bad.
Since they seem to imply the definition of 'underclass' means 'people that earn less than their employers,' America had an 'AI underclass' as soon as RLHF started being used.
No solutions are offered to this 'problem,' just some bashing of corporations to make the audience feel good at having someone to be angry at.
This author has taken the AI topic du jour and ran with it, see:
"ChatGPT Is Already Obsolete" - story is basically 'novel tech improves quickly!' "Conspiracy Theories Have a New Best Friend" - story is basically 'LLMs can be used to make propaganda!'