Your petty point is meaningless. The research demonstrates that star systems can generate the chemicals. Whether it did so 375 years ago, or last week, is meaningless to the question of whether they do this.
It certainly is relevant if you want to extrapolate those past conditions as present events, or being related to present or more distantly past conditions that are not currently observable.
(Get out the time machine and jump 375 years into the future to prove it is not a super nova by then or a gas giant, then go back billions of years to see where the earth came from - - and those comets...)
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The research demonstrates that star systems can generate the chemicals.
No it does not, the article clearly states only what is believed...
“Here on Earth, the molecules are believed to have arrived billions of years ago, possibly via comets or comet dust that rained down from the sky.”