I must have misread it, I thought they were trying to verify the dads date of birth.
Wictor says:
"(7) Strzok Jr's Wikipedia page is fraudulent.
The stuff about his background links to articles that don't back up the claims.
His birth date is unknown."
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The date of birth Wikipedia lists for Peter Jr. is "1969/1970," so I think that's why Wictor says his date of birth is "unknown."