Um no.. Sowell endorsed Ted Cruz in the primaries and wrote quite the scathing critique of Donald Trump:
https://www.realclearpolitics.com/articles/2016/02/16/traged...
In Sowell's own words:
> Some seem to think that Donald Trump's lead in the polls and in the New Hampshire primary make him the most electable candidate, even if he often acts like an overgrown spoiled brat.
Secondly:
> opposition to criminal justice reform and particularly decarceration,
is a common position amongst blacks in America. Many civil rights advocates fought for tougher criminal sentencing in the 80s and 90s, including many in Congress, such as Charlie Rangel. In this regard, Sowell's position is more in line with the views of African Americans of a certain age, instead of his conservative beliefs (recall, many libertarians were against the war on drugs: https://www.theatlantic.com/ideas/archive/2020/07/praise-imp...)
> a spicy "Brown v. Board of Education was decided wrongly" take
Here is Sowell's opinion: http://historynewsnetwork.org/article/5160. As someone who himself went to a segregated school, I feel he is entitled to his opinion on whether or not the children who went there feel inferior, which is the reasoning behind Warren's majority opinion. That being said, Sowell is extremely pro-school-choice and generally against publicly run schools, so in Sowell's America schools would have been naturally desegregated due to market forces.