I'll confess immediately that I didn't read TFA. I just want to drop this link to a nice Isaac Asimov essay, back from 1962:
Not as We Know it – The Chemistry of Life
Remember that Asimov was a professor of biochemistry. In the article, he investigates alternatives to the chemistry of life as we know it. He comes up with the following list:
[H]ere, then, is my list of life chemistries, spanning the temperature range from near red heat down to near absolute zero:
1. fluorosilicone in fluorosilicone
2. fluorocarbon in sulfur
3.*nucleic acid/protein (O) in water
4. nucleic acid/protein (N) in ammonia
5. lipid in methane
6. lipid in hydrogen
Of this half dozen, the third only is life-as-we-know-it. Lest you miss it, I've marked it with an asterisk.
When you read the article, you may want to skip the first bit and start from about the paragraph "Well, that's what I want to discuss."