Earlier quoted context omitted.
I always think of the famous Hindenburg crash tape. "it's a terrific crash" 1937 for those, like me, that weren't sure of the decade. https://genius.com/Herbert-morrison-hindenburg-disaster-broa...
Sure - but that is "terrific" in the still-current sense of "massive, of great size" - not the archaic use in the parent.
This posting [1] puts the usage change from around 1880-1930. I've always taken the modern usage to mean unusually fine/magnificent.
[1] https://english.stackexchange.com/questions/38606/what-gave-...