What is there to be happy about that the Tree of Life has begun to bear flowers and fruit? That old tree has been alive for nearly a hundred thousand years, and it has been producing fruit for seventy or eighty thousand of those. It blooms and bears fruit every year, what's there to be happy about?
Emperor Niro certainly didn't understand that not only had the Tree of Life blossomed and borne fruit, but the elves had also eaten the new fruit without any more diarrhea. The God of Life had forgiven them.
Ever since they were punished by the God of Life, Gailard felt an endless pressure bearing down on her, so heavy it almost left her breathless.
This wasn't a matter of 'the god who sheltered them is gone, and from now on they have to be self-reliant and protect themselves.' It was about the Elf Clan possibly falling from being a long-lived species to a common one, their lifespan shrinking from a thousand years to a mere two hundred years.