Deliberate mistake: If this movie takes place 7 years after the original, how could his daughter be 13? He was part of a government project, I doubt they let them leave for relationships.
Suggested correction: This is a retconned film made after 2 other direct-to-video Universal Soldier movies were made. While the film is considered non-canon in the series, in the film itself, the facts of the original are altered to allow Luc to have a daughter.
Exactly. If this movie changes things that happened in previous films than they don't make sense in context to the series, that's a mistake.
Essential the film can be considered the same as a reboot. Reboots and remakes can alter characters without being considered mistakes because they're not actually part of the film series, just like "Universal Soldier: The Return" is not part of the Universal Soldier film series. However, changes to characters in retconned films, shows, or books, by definition, are not mistakes.