Personal data is about identifying a person and relating information to that person. A name in an unrelated text field isn’t personal data if you can’t tell the relation between the name and the person who input it, or any surrounding data. The contents of a repository, however, and the interaction with Copilot, can very well help identifying the account holder and their personal data. For example, I might be processing personal health data identifiable as such in a private repository with the help of Copilot.