That is why the title stresses that this is a new record for an eukaryote.

It is well known that the much less complex bacteria & archaea can live at much higher temperatures than any eukaryote.

the numbers put the idea of total extinction of life on earth way out there in the relm of the improbable, and suggest that perhaps some living things will survive the expansion of our sun, when it inevitably turns into a red giant, or at least till some later phase in that process it also means that irrate alliens looking to rid the universe of earth life, have got there work cut out for them

Evolution is beautiful. To me, it's the most beautiful process ever chronicled