The important question is how many kids have 5 micrograms of lead per decaliter of blood [0]. This is the reference blood lead level and much more useful for tracking progress (or decline).
I’m surprised that the article sticks with the “no lead is good” rather than the public health level.
The link that you posted mentions 5 migrograms per deciliter of blood, while your post mentions 5 micrograms per decaliter of blood. This is a 100 fold misstatement.
A deciliter of blood is 1/10 of a liter, while a decaliter is 10 liters. For reference, I believe that the average adult male has roughly 10L of blood, so 5 micrograms per decaliter would be 5 micrograms in the body of an adult, whereas 5 micrograms per deciliter would be probably something like 5 micrograms in a baby. I don't necessarily trust this site (https://www.healthline.com/health/how-much-blood-in-human-bo...), but it says that babies have ~75 mL (0.075L, or 0.75dL) while the average adult has 4500 - 5700 mL of blood (4.5-5.7L, or 45-57dL, or 0.45-0.57DL).
I'm also surprised that the article sticks with their "no lead is good" posture.
I’m surprised that the article sticks with the “no lead is good” rather than the public health level.
[0] https://www.cdc.gov/nceh/lead/prevention/blood-lead-levels.h...