I didn't post this because I don't know what to think.
The funny thing is it could be one of those things where alien life is found and nobody really notices because nobody trusts the announcement at first and there is lots of controversy until it slowly, over years, becomes mainstream scientific consensus that, yes, the meteorites contain alien bacteria.
I mean what the scientist is saying is entirely plausible. But it needs more peer review, and more evidence (i.e. more meteorites, which is a difficult thing to achieve).