@smveerman Mid-platform switch use has been a thing at Dordrecht for a loooooong time :) I've often seen it scare people waiting on platforms over the years, with a train suddenly clanging and seemingly coming their way...
I don't know *for sure* why they do it, but this goes back at least 7 years, and it probably has something to do with how sometimes both ends of the platform are in use, and one train needs to pass another via the adjacent track to arrive at the far end (and they've just standardized those movements even when there is no train to go around)