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The abstract of the paper by Bellucci et al that is the source of the Guardian article states that "Two, currently unresolvable hypotheses for the origin and history of the clast are allowed by these data", i.e a lunar or an earth origin. Whereas the Guardian article suggests pretty unambiguously that the study says an Earth origin. So basically, not very good reporting from the Guardian, but did generate a few extra clicks through for them I guess.
JoePablo
moocher
The series of events that allowed a bit of Earth rock to form, get to the moon and then be recovered and brought back to Earth again just seems implausible to me. I'm not an astrogeologist though.
https://www.theguardian.com/science/2019/jan/25/4bn-year-old-earth-rock-found-in-apollo-14-crews-moon-haul