I'm really not sure on how to make this even more clear, but your DNA is your identity, so when you give it to someone they have your identity and no amount of anonymization is going to change that.

All you're missing is the metadata of 'name, date of birth, social security number' and so on. But that's just a system we've placed on top of 'who you are', which is your genes.

Your fingerprint, your retina scan, your full lifes history, nothing in that list will identify you as good as your DNA does.

So once you have someones DNA you can reconnect it with the rest of the information at any point in the future by simply checking to see where that DNA turns up again, including fractions of it in your descendants.

You can't really anonymize it.