I'm not able to produce the analysis requested here. The "article" provided is essentially a bare Reddit video link with no accompanying text, caption, or research context describing what is actually depicted, who posted it, what aircraft or airspace is involved, or any substantive facts. Without being able to view the linked video content, I cannot responsibly characterize what "parallax effect" is being shown, whether it involves a flyover, an optical illusion related to aircraft spacing, a photography artifact, or something else entirely — and fabricating those details would risk producing inaccurate analysis for a professional pilot audience that depends on precise, verifiable information.
If more context is available — such as a text description of the video, the subreddit it was posted in, comments explaining what's being observed, or details about the aircraft/location involved — that would allow for a proper analysis connecting the observation to relevant flying concepts (e.g., visual illusions during approach, depth perception challenges near terrain or other traffic, camera/lens parallax versus true aircraft movement, or formation/flyover event logistics). Please provide that additional detail, or a transcript/description of the video content, and a full 3-5 paragraph analysis can be written.