>>The moon "relates" to the Pleiades in exactly the same position every 28 days.<<
So that is 3.6% probability for a match on this particular event. But. If one uses the ecliptic longitude which is a better indicator of alignment then at the time we have exactly 66,6 degrees the longitude deviation of the Moon and the brightest Pleiades star Alcyone is 0.172 degrees. So that is 0.05% probability for a match on this particular event.

3 years is 39 moon months. So that is 2.6% probability for a match on this particular event. Combined event yeilds: 0.05% x 2.6% => 0.0008% probability.

>>We don't have superquakes every three years.<<
From a data base of 3 last triplets, we had 2 superquakes out of 3 , that's 67%. On the other hand from a data base of 114 months {[(3 x 13)-1]x3} = 114, of non closest approaches we had zero superquakes , that's 0%, but even if we had one that would be 0.9% probability.

>>The altitude isn't the same as the altitude of Japan.<<
What do you mean? Why would someone want to encode the latitude of Japan, we all know where the quake took place. The altitude of the Moon I posted is that as seen from the epicenter position at the time it took place, not what it is in London or Paris.

>> The moon has an altitude of 66.6 degrees at some point every single night of the year.<<
Depending on the year it might or might not, during the day or night but a superquake does not occur every single moment of the day. We are interested at what's happening during this particular instance.