The video itself may have seemed like an innocent hands-on, but it did include footage of an iPhone X with special employee-only QR codes. A notes app was also shown on the iPhone X in the video, which appeared to include codenames of unreleased Apple products. Filming on Apple’s campus is strictly prohibited, so filming an unreleased iPhone X is a definite rule violation.
We’ve seen similar dismissals in the past. A Microsoft employee was dismissed after his son posted pictures of the Xbox 360 before its release. The Apple engineer in question had worked at the company for around four years, building the iPhone RF and wireless circuit design. The Verge reached out to Apple to confirm the dismissal, but the company has not yet responded to a request for comment.