I don't think Truss is 'braindead'; more likely an introvert who finds the public spotlight agonising. From the hustings on Thursday in Leeds, the following views became apparent:
Rish! Sunak: About levelling up. I did really well at school because I worked very hard and my parents gave me all the support and encouragement I needed. My mother was only a pharmacist [no mention of Dad, or the £30K pa needed for each of he and his brother] and if I can do well, then so can everybody. The reason people fail is because they don't work hard enough or as hard as I did. I am all for bringing back grammar schools and extending them in the regions they already are.
Liz Truss: About levelling up. I went to a school that helped me do well. However, I made my criticisms of it because I could see that whilst I did well, the school failed the children who fell through the cracks.
IOW Sunak believes his privilege was due to his hard work and merit and the same applies to everyone. Truss could see that kids don't fail because they don't work hard enough but because the school fails the kid. She is hardly 'a liar' if that is her subjective opinion based on her own experience of the school.
The hustings showed me that Sunak has a superficial grasp of politics, whereas Truss was astute and had the perspicacity to observe that while she was 'All right, Jack', other kids were not. When I was at school I simply thought, 'Thank goodness I came top and not bottom' and most people would have put down failure as a lack of ability. If Sunak had done his homework, he would be aware that whilst the mandatory 11-plus for all and grammar schools were originally brought in as some kind of 'social leveller' they were abolished because the Crowther Report showed they gave working class pupils very little advantage. They started off on a par with their wealthier classmates but soon fell back and often left with no qualifications at all. Sure, there is an argument for grammar schools for the more able who don't want to waste time with pointless 'inclusive' topics that don't lead to qualifications, but that has nothing to do with 'levelling up'.