Unless you're thinking that life can't evolve in any place other than an Earth-like enviroment.It's obvious that, if life evolved on other planets, it would have adapted to its planet's conditions not Earth's.
Er, they did make a clear distinction, and explain why; e.g. (quote from the article): "... boosts the chances of finding life on non Earth-like planets circling stars other than our Sun"come to think of it, why did they say Mars-like planets and not come out and say "Earth-like" planets
Um, there is an interesting difficulty being assumed away here. Leave aside whether mainstream science can 'believe' anything; let's say you wished to study, using the scientific method, 'life in non-Earth environments'. How would you go about it?... mainstream science is finally recognizing the utter anthropocentricism of believing that life couldn't exist on planets that are uninhabitable by typical "Earth life"