To qualify for free school meals, you must, as a household, be in receipt of one of a few qualifying benefits, or on universal credit with an income of less than £7400 per year.
That is £616 a month. If your income is more than £143 a week, you will not qualify for free school meals, regardless of how many kids you have to feed, or how many other financial responsibilities you might have.
What JO is saying is that we can set kids up to succeed in life, by making sure they eat properly. Fed kids are happier, healthier, and more productive. And by setting the kids up to succeed, we're also setting teachers up to succeed. Kids who get decent meals on a regular basis are easier to teach. And it takes a small burden off parents, many of whom are already stretched to their limits. So give kids breakfast and lunch at school. It will make a positive difference to everyone involved.
I wholeheartedly agree with him. If we really want to 'level up' (I fucking hate that phrase, but anyway...) then we need to start with the absolute basic building blocks. Education is fundamental to success. And health, freedom from hunger, and access to a positive learning environment are key to success to anyone trying to educate themselves or someone else.