I would say from the outset that portions of the article beg questioning the accuracy of the report. Specifically, this portion;
Journalists and officials at the Lounge were afraid when they saw the airplane flying overhead, its under-carriage fully retracted for landing, but as it flew very low, about five meters to the roof of the Lounge, it suddenly went up again, gaining altitude and veered-off towards runway 18R.
Based upon my limited experience, in most cases, the under-carriage is extended for landing, and retracted for flight. My guess would be the five meter estimation would be less than accurate also. It will be interesting to see what knowledgeable people observed, and how it differs from this report.