No, when a quarter note is taken as a beat, three octaves are taken as a beat and a half. Two octaves is a beat, and three octaves is a beat and a half, isn't it? However, you didn't read my explanation carefully: "If the rhythm is divided freely, its quantity is inconsistent with the basic division, which is called a special form of rhythm division. That is, in the form of Legato. " The reason why a 3 is added to the triplet with a connecting line means that these three octaves can only be demonstrated as a beat. Remember: the triad is a whole and must not be disassembled.
You should read my solution carefully and you will understand.