So our options are...
a) Ivis forgot
b) Ivis is feigning ignorance for some convoluted but ultimately benign reason (for MC anyway)
c) It's not Ivis, either because
c1) It's Ivis' descendant, or
c2) It's someone pretending to be Ivis, for whatever reason
d) Ivis remembers, shenanigans ensue
The instantly gratifying option is the D (lol) but I'm willing to bet on b)