Hanafi commentary describes another case: after reaching puberty, a person may renew iḥrām for the obligatory Hajj before the standing at ʿArafāt, with a different result.
That is a commentary qualification, not explicit added wording in al-Quduri’s short sentence. The statement about simply continuing the original iḥrām must be kept distinct. The historical enslaved-person case has its own analysis.