I guess in a pedantic manner, but then they were always documented, since their country of origin knew who they are.
In terms of immigration, undocumented typically means you don't currently have a valid visa or residency permit. In that case no, they would still be undocumented, since the ITIN doesn't grant them either.
In terms of immigration, undocumented typically means you don't currently have a valid visa or residency permit. In that case no, they would still be undocumented, since the ITIN doesn't grant them either.