I'm Japanese, and this is the first I've heard of Gakutensoku. If you asked people in Japan for an old Japanese "robot", I think most would come up with this tea-carrying karakuri doll.
https://en.wikipedia.org/wiki/Karakuri_puppet
That one predates the word "robot" entirely. The design is documented in a 1796 book called "Karakuri Zui", so Edo period, shoguns still in charge.
Korea does this, also. Sometimes I'll get confused at a restaurant or other sign that is just 2x2 array of syllables. Is this horizontal or vertical? Even more confusing is when it can be sensibly read either way.
That one predates the word "robot" entirely. The design is documented in a 1796 book called "Karakuri Zui", so Edo period, shoguns still in charge.