It doesn't reduce the demand for high-end jobs, it might reduce the demand for the currently large variety of high-end jobs.
I agree with you, but I had to read that sentence three times to realize that.
I think what we agree on, is that a lot of white-collar jobs which often require higher education, are actually fairly easily automated.
A few white-collar jobs however would require strong AI to automate.
But perhaps we don't agree that the first one is "a lot" and the second relatively "few"?