I was thinking that header image in the liveflightstracker link was AI Slop, then one of us had a stroke in the bottom left. Weather avoidance, geopolitical restrictions, air traffic control reroute, another geopolitical restrictions, and THEIS PERVES ON CONROLL MEFTIGN LIN£AION GARE OFFIANOSI/NE

Stick with the antipode link and the interactive map to understand the normal curve of a straight line across a sphere represented on a flat map. The liveflightstracker link just mentions a bunch of generic reasons, has no picture to help describe the flat/sphere translation, and adds nothing particularly useful to the route in question. The route takes a J shape where the initial leg is straight, not even slightly curved as it should be. The actual answer likely lies in some combination of standard flight routing and avoiding certain countries.