Yes. Half the eggs you get in the supermarket actually come from splitting open the males rather than waiting for them to grow old enough to lay them.

Is true I think. Overstated a bit possibly?

IDK I don’t work on a farm etc

Male chicks get shredded because they do not lay eggs.

Male chicks are largely considered a waste-product of the poultry industry, you don’t need many males to maintain the population. It’s cheaper and easier to identify them once they hatch, at which point they have no economic value and so are killed.

Basically, male chicks are worthless on egg farms. They all get put into a macerator to be disposed of. The rate at which they do this is unfathomable at a single farm alone.