What this information tells us, is that on Earth, the conditions for life need not be 'perfect' and what organisms require, at the minimum for life, is far less than we had appreciated. As for Archeal life on Io, I am not certain that can be said, but the broader question it raises, is the possibility of life elsewhere in the Solar system, not necessarily Io. Certainly, we understand that the basic necessities for life are simply water, and a source of energy and nitrogen. Some of the more unique organisms get their carbon and nitrogen from rocks, or use sulphur from oceanic vents as their energy source, much as we use oxygen. People who study these sorts of things, biologists, astronomers and the like have taken a keen interest in the possibility of life in the solar system.
Several bodies are of interest, bacause of our understanding of the tolerances of life.
Mars is one, primarily because it seemed to have held life once, and there is the possibility of buried Martian water, or microorganisms living beneath the surface. The other two bodies of interest are Io, as you mentioned, and Europa. Europa is of significant interest, because geologic evidence supports that the ocean of Europa may be molten beneath the surface, and if temperatures and conditions are suitable, like may exist. Io, is another target, not because there may be an abundance of water, but due to its heave volcanic activity. Volcanoes are a source of significant chemical energy, both as heat, and elements.