These movements can be used to traverse certain obstacles more rapidly or aggressively, but their use in parkour is ultimately dictated by need. It’s not that flips, tricks, aerial acrobatics, etc, are banned from parkour.
At its broadest definition, it implies a low-impact and considerate attitude towards bosses, co-workers, family, friends, driving, consumer purchases, and the environment (natural or manmade). Parkour is a lens of efficiency applied to every aspect of your movement through life. You pass or traverse a barrier in whatever way suits you and the moment there’s no one prescribed method for anything. In French, the term passement is used for overcoming any obstacle.