Quoting from the article:
"The Japanese Hayabusa2 probe, launched in 2014 with the goal of sampling the asteroid Ryugu, is already on its way back with Ryugu dust onboard, a sample that may contain carbonaceous chondrite, Sokol noted.
These asteroid scraps will be truly pristine, having never touched the atmosphere or sat atop rainforest soil," Sokol wrote."
end quote.
Apparently Sokol (referring to the sample as "pristine") has not heard of solar and cosmic radiation. Since their sample was taken from the surface of the asteroid instead of a deep core sample, it is difficult to understand how it can be "truly pristine". One imagines that billions of years of intense radiation might have a significant impact on the chemical composition of organic compounds.
Actually it is not only Sokol who refers to such samples as "pristine". There seems to be a consensus among these scientists that their studies are attempting perfection from "pristine" samples, which is over-sold based on what has been analyzed so far. Any attempts at sampling pristine material would require substantial bore samples, and even then you would need data from several depths to confirm the findings. The composition of surface material would likely be vastly dissimilar to deep core samples, and nearly impossible to "deconvolute" to obtain its original chemistry.
In any event, this radiation might result in both assembly and degradation of compounds, depending on exposure levels and organic content. Inorganic content could also play a role in both mechanisms, with some possibly catalytic as well as stereo-selective. All of life on earth uses a number of stereo-isomers, particularly polymers.
Still, it remains very interesting that these objects are the source of a wide variety of abiotic organic chemicals that seeded the earth for abiogenesis to begin some 4 bya.