LabGHOST (Labtoast) on Nostr: "Variable exponents take the value of the symbol during application." y is translated ...

"Variable exponents take the value of the symbol during application." y is translated into 2 here, no? So that must mean the value of y is 2. Where is y set to 2?

I get the sense that I'm thinking about this the wrong way. Perhaps this diagram isn't meant to stand alone? Let me read up on rejoice more and come back to this.