Based on https://github.com/ldc-developers/ldc2.snap/blob/1.2/snap/snapcraft.yaml, the three aliases are for:
All of these commands seem reasonable for the ldc2 snap. Note, they exist as commands in the 'ldc' deb in the Ubuntu archive. Considering the described workflow for D tooling, granting the alias seems very sensible. Furthermore, the ldc2 snap is an officially maintained snap from ldc upstream.
@joseph.wakeling - can you give either give the store URL for the snap or give the name and publisher of the snap?