The geometry gets iffy with these code 1A facilities and it depends on the adopted offset from centerline for the new taxiway centerline.
It can legally be down to 37.5m centerline offset.
You throw in the approach / departure baseline being 60m, and the displaced thresholds already there at both ends, and big construction equipment starts to really impact the availability of the aerodrome.
Code C/D/E @ 90-100+ meters centerline to centerline and excavators are suddenly outside the transitional and approach splays and everyone's happy.
Without seeing it I'd have to assume they've made the right call.