@sirfredfredgeorge
Perhaps the news is "actually schools didn't spread it much before because there's little acquired immunity in the population", I guess that would be a surprise to many.
Immunity is thought to wane.
Not sure what point you are making here, and on what basis?
Schools appear to have been a significant source of transmission previously.
Now that almost everyone apart from school students have been vaccinated, and there are even fewer mitigations in schools, they are likely to be an even more major source of transmission. How could it possibly be otherwise?