Yes they look like something made by scraper-like tool, yet, the round belly profile can be as easy faceted with straight scraper indeed like some kind of spokeshave. I have made me variation to one in ash wood, and it is amazing tool, though unless the sole is plated with bronze or say bone it wears sown very quickly.
I still think that spokeshave is the ultimate bowyers tool and can be used on "one tool does it all" much more elegantly than rasp, altough the second is sometimes neded for very dificult wood. The images of old "bowyer flotes" as presented look to me more like single cut rasp of kind, which is very fine and common tool among musical instrument makers, rather than big honking modern version, with set of scrapers, which leaves in me impression of something unwieldly and badly controlable, or something meant for diferent sort of work (like planishing table tops).
I m oggling Lie Neilson tools for something like 5 years, so dont tempt me, old satan
Jaro