比較接近事實的原因大概是,不滿18歲無權簽署Certificate of Loss of Nationality of the United States, 父母/監護人亦不能代簽。 https://fam.state.gov/fam/07fam/07fam1290.html#M1290 e. Parents or guardians cannot renounce or relinquish the U.S. citizenship of a child who acquired U.S. citizenship at birth.
g. Age limitations in the INA: INA 349(a)(1), INA 349(a)(2) and INA 349(a)(4) contain specific provisions limiting their applicability to a person “having attained the age of eighteen years.” No finding of loss of nationality may be made for these acts committed by a person under the age of eighteen.