IMHO I feel the title is appropriate. They are not claiming to have found life on Mars, they are making the very pivotal claim that there are forms of life that can turn liabilities on Mars into assets.

The title nor the article ever said that life was found on Mars ?

scientist discover microbe [...] from martian soil

[...] microbe produces oxygen from martian soil

I guess you read it the former way while most people read it the latter way. Neither is wrong or right. Slightly garden-pathy title.