Actually lounge access on AI is very questionable - first of all AI status - silver, golden egde or maharajah comes "by invitation" upon achieving an unknown number of flights or miles that gets updated by AI "from time to time", secondly lounge access is only available at "select domestic and international airports".
Lounge access would be available at Chennai - since there is a Maharajah lounge there, but either way lounge access at SIN would not be available unless flying biz since its a third party lounge.

Point on IFE noted - nothing to do with flying biz or whY, but it is an added benefit when compared to the old and ratty IC 320's that were flying the route.