He’s right. There just isn’t the political will in the population to reopen the topic of Brexit now. Whether anyone likes it or not, the things British people really care about right now, in no particular order, are:
Inflation
House & utility & food prices
Immigration
NHS waiting lists & more dentists
Train infrastructure.
People can make very legitimate arguments linking Brexit to those issues, but it’s not politically viable to open that can of worms again. They just really want their lives to improve for the first time in over a decade.