Yes, jiujitsu is an exception. I learned that sometime in the past two years, but failed to update my comment ;-)

The precise statement is that samurai had a monopoly on force and it was illegal for others to learn martial arts. Thus extant feudal Japanese martial arts were for samurai. Sometimes samurai were unarmed, hence jiujitsu, though it assumes both combatants are heavily armored.

What I really meant in my comment was that karate was imported around the end of the shogonate and that judo and aikido were invented around 1900. However, they weren't invented from scratch, but adapted from feudal jiujitsu. They probably have as much claim to that tradition as brand-name jiujitsu. In any event, jiujitsu probably wasn't static or monolithic in 1900, either.