1. This is based on the analysis of a "technological" water that accidentally got into a drilling column (whatever it is) dating back to May 2012, and not on the specifically collected samples from a recent drilling that will be arriving to St. Petersburg in May of this year (apparently it takes 6+ months to ship them).
2. "You have to understand that only a bacteria DNA was found, not the bacteria itself." This is what the representative of the science agency said. Literally.
So.
I wouldn't be getting too excited. This reads like a PR or a vanity piece rather than a proper science report, meaning that is probably aimed at securing additional funding or something along these lines.
(edit) Also, doesn't the process of comparing DNA to the database samples smell a little like CSI bullshit to anyone? This is not my domain, but I would imagine that there's hardly a comprehensive database of a DNA of all existing life forms on Earth. I assume there's a way to see that a DNA is "alien", but why bring up some imaginary database if you are making a serious scientific announcement.