How does a 757 complete a 5.6 degree glide from 3,100' - Air Greenland BGBW

[RMC]

In the late 90's I used to go into London City (similar approach angle) in a 30 seat turboprop and we had to abort if flight idle was 2% above minimum value as we would accelerate and be unstable by 500'

So how did Air Greenland do this when they used to fly their 757-200 into BGBW a few years ago.

I can't find a Short Field Performance version as Boeing offer for the 737....or was it just an offset visual only approach?

Thanks in advance.