Well I don't have the altitude data but if I follow the line it seems he arrived from the south, made an orbit over the airport (first turn) then went into a holding pattern which was not the typical elliptical form (i.e. rate turn with a straight track between).
If the wind came from the east, it could slowly shift the orbits to the west, allowing for several "balls" to occor.
The last part is perfectly logical.. .. he leaves the holding pattern on a southern heading and while descending makes a final 180 turn into the localizer for the runway. I don't know what the Runways headings in ARN
are but this is at first glance what it looks like
So I think credit should not go for the pilot for flying the pattern (as he may not even have been aware of it) but to the guy with rich imagination who had nothing better to do then follow radar returns