I don't suppose anyone has an idea of what publication/ where Draeger was known to have made this statement- or any like it? (wasn't mentioned in article).
I believe this was said in one of his books - "Modern Bujutsu & Budo Volume III: Martial Arts And Ways Of Japan".
Anyone with a copy can verify this, I can't find mine. Imho Draeger had a very distinct separation between Do and Jutsu arts which I don't think was shared by many Japanese practitioners who often used the terms interchangeably.