I felt that the placement of the stretched barracks and also the first engineer out of barracks would have revealed enough of the tech oil derrick for the second engineer to enter it. First engineer walked by around frame 444.
Good spot on the illegal stretch Also found another good giveaway (see below)
Proven as per your XGS replay and screenshots [Frame 573: Engineer in capture mode for unrevealed Tech Oil Derrick]
Previous (1st) 32-day ban: http://xwis.net/forums/index.php/topic/168673-arpit2006-maphack/
But the cheat has been found and punished.