They used the tried and true method of spouting a percent increase, rather than the actual number. Out of the millions of children under 19, only about 350 had died of covid (and that's with the exaggerated reporting associated with covid deaths), so if that doubles, they won't report the number, they'll say, "A 100 percent increase in deaths of children from covid!". They do the same with cancer risk. Something might have a 0.0000001 percent chance of causing cancer, and then if they find that is up to 0.0000008 percent, they'll report an 800% increase.