Hi cosmo kramer,
Please see
https://www.vnv.nl/commissiepub/4450
"As discussed previously manufacturer data is normally based on a threshold crossing height of 50 ft and a touchdown point that may not be achievable in line operations."
The picture shows the increased Landing Distance by being 100 ft over the threshold = 300m.
All of our performance data is based on LDA (i.e. assumed from being 50 ft above the landing threshold.)
Please See Alicante
ALC Difference between RWY 10 LDA (3,000m) and Distance beyond Glide Slope (2,650m) = 350m.
& CDG
CDG Difference between RWY 27L LDA (3,600m) and Distance beyond Glide Slope (3,256) = 344m.
& Madrid
MAD Difference between RWY 32R LDA (3,000m) and Distance beyond Glide Slope (2,722m) = 278m.
It would be interesting to learn from the OP what the difference in the published "LDA" and "Distance beyond the Glide Slope" was for his 2,000m airport.