I believe that is it. Those guidonnet levers are generally found on full-on touring bikes (campeurs) where the comfort of a more upright position is more important than outright speed. The drop bars still give you the "trois positions" that were (and still are) favoured by those spending long days in the saddle.
I recently put a pair on one of mrs non-fixie's machines and found they work rather well. They seem to flex much less than most "turkey levers".
These were made by C.L.B., BTW:
View attachment 906430