You hit the carriage release and it lets you slide the carriage, so you can type things in forms. Mine was an electric typewriter and I got rid of it thirty years ago, but I don’t think that it was in any way unique.
I don't think you are understanding my point. WHEN you release it, it always falls back into the spaces required by the geared rack on the carriage.
You CANNOT release it in such a way that it will type between where the letters normally fall. It will always line up with the normal letter placement.
What I am saying is that your explanation doesn't explain how the letters ended up between their normal placement. A typewriter cannot do this, even if you use the carriage release.