I have not once ever seen anyone shorten the name of a Debian release like that and I’ve been following/using Debian things for two decades.

Squeeze, Wheezy, Jessie, Stretch, Buster, Bullseye, Bookworm, and Trixie aren’t “ds”, “dw”, “dj”, “ds” again, “db”, “db” again, “db” for a third time in a row, or “dt”. Both stable and sid are “s” too.