Is this route of a airforce jet on flightradar faked?
No, that has not been faked. 

Flightradar is updated with a low frequency (from that screenshot I'd estimate once per 10 seconds, maybe more). This is done to reduce the computational demands on both the service that sends the radar info to Flightradar, and on the Flightradar servers. 

Each dot in the track is one position update, and the website software just draws straight lines between them, which results in sharp corners. The real flight path will have a radius.