This is an interesting theory.
I watched the video you posted about birth certificates, and i remember i had read years ago that a person's name in ALL CAPS like on the birth certificate (or other govt documents) was basically them being now "property" or a "corporate entity" or "strawman" that the govt owns, while the govt can't own the actual person. I remember at the time there were all these people who were planning on not getting their children birth certificates, so they could be "free". As far as i know it is not illegal just inconvenient, and potentially dangerous.
Anyway, i thought that was the hidden reason for birth certificates, i hadnt thought there could be more.
But, i think you could be on to something.
The newborns are required by law to get this blood test and they test, among other things if the baby has any genetic conditions that are rare but life threatening. There was this stephen king book called the institute in which tptb identify and surveil children based on the results for one of these blood tests. It could very well be possible that a combination of birth date time and location and the results of these blood tests are used to identify children to use for either rituals or as "assets".
Hopefully not, but i would not be surprised.
Sort of related thought... occultists put a lot of importance on a child "choosing" their own birth date and time.