I grant that if most people are using it one way here I was likely wrong for the way it is typically used by the normal open source community, I followed up with a reply saying it would likely be more correct for me to have said "improperly licensed" to be included in the training set.
Still it being private means it probably shouldn't be in the training set anyway regardless of license, because in the future, truly proprietary code could be included, or code without any license which reserves all right to the creator.