They don't as far as I can tell. Alembic will set up a new long scale bass with 40-100 or 45-105 strings, but they only have the 45-105 in short scale. What other companies do is their business. There generally aren't as many gauge choices in medium or short scale as compared to long, so it's hard to say for sure. Maybe people that play shorter basses have a historical preference for skinny strings?
If you do a search, you may find a lengthy discussion or two on string tension vs scale. In short, a 34 scale bass has the first fret at about 32 from the bridge. If you tune your 34 bass down a half step, you'll have an ~32 E string if you play at the first fret. In order to do this, you loosened the string from the 34 E string tuning. If you have a 34 bass, tune it down a half step and you'll get an idea of what those strings would feel like on a medium scale bass.
By the way, I had been chatting with Spencer about that bass. It's a beauty and I'm glad it went to a good home. I felt badly that he had to sell and that I couldn't justify buying it.