Well, it's more important to see that actions Rishi Sunak is taking than what his background is. This is an important problem (STEM - Mathematics Education) that he is tackling which no one else before him bothered to.
Regarding his background, it's like saying the CEO of the company has no clue about the software that we build because he never fixes the bugs. The job of a Prime Minister of a CEO is not to be in the nitty gritty of the issues, that's the job of the people who work under him just like IC's and Eng Leaders, then they are supposed to bubble up the important issues and explain to him. Having said that, he is best suited as he brings strategic thinking (learned at Goldman, Stanford) to solve these dire problems.
Regarding his background, it's like saying the CEO of the company has no clue about the software that we build because he never fixes the bugs. The job of a Prime Minister of a CEO is not to be in the nitty gritty of the issues, that's the job of the people who work under him just like IC's and Eng Leaders, then they are supposed to bubble up the important issues and explain to him. Having said that, he is best suited as he brings strategic thinking (learned at Goldman, Stanford) to solve these dire problems.