I myself can verify it is TRUE.
I just came back from KLIA2 using metered taxi to Bandar Mahkota Cheras.
Coupon is RM 84
Metered Taxi is RM 62
Why they promote Coupon Taxi, because they can get RM 9 compare to metered taxi can get RM 2 nia.
Excerpt:
So, here's my little experience with the taxi system. Apparently, there is some hanky-panky going on among the taxi people here. When I went to the 'Metered Taxis' counter, the lady selling the tickets told me that there would be a very long wait as there are no metered taxis there. She urged me to take a 'Blue' taxi or 'Budget' taxi as they are all ready and waiting. Since I was not in a rush, I told her it was ok for me to wait. But she kept trying to persuade me to take the other taxis. Eventually I said no and would wait it out.
When I went outside to wait, I was instructed to go to an area on the left section after exiting the main doors. There were 2 people in front of me waiting too. In less than 5 minutes, one taxi came and they boarded it followed by another '1Malaysia Taxi'. so in total, I waited less than 10 minutes.