Looking for life around white dwarf stars
The main thrust of the article - that the "building blocks for life" are fairly common throughout the galaxy - seems straightforward enough, but all the talk about white dwarf stars seems out of place.
A white dwarf star is a stellar remnant - it's what's left after a main sequence star has gone through its red giant phase, so if there had been life around the progenitor star i.e. before the red giant phase, it would either have had to leave or get fried.
Once the red giant has finally used all of its remaining fuel it will collapse to form a white dwarf, about the size of Earth but with a mass comparable to the Sun. It'll have no internal source of energy now though, and only radiate the thermal energy gained from its collapse, so once it has formed it will inexorably start to cool down and this is a problem for the subsequent development of new life because the habitable zone will change relatively quickly, in the order of a few billion years, so if life did develop it might not have very long to get used to it.
In addition, although white dwarf stars can start out to be very hot > 100,000K, their small size means that any habitable zone would have to be relatively close to the star, far closer than Earth, and quite likely to be close enough to be tidally locked.
Then there's the issue of where these closely orbiting planets have come from, following the red giant phase that would have entirely engulfed any existing planets in those regions.
I'm not saying that any of this can't happen, but white dwarf star systems seem an unlikely sort of place to look for life.