The meaning of the message is simple:

Every time Balamb Garden time travels,itīs gauge rotates faster.The more further the era the more it rotates and therefore the more it needs RSU (R. Steam Units)
There is a division between eras there with an holographic wall between them.This wall passes on the middle of the crater.These two eras are distant in time so the Garden īdoesnīt had enough RSU to cross through it.

Donīt worry,I will not proceed with this without trying to give a proof.