This is a click bait article that may or may not have been auto generated. Everything it says is a word salad of science related words and generic quotes. It doesn't have any pragmatic value whatsoever besides to get ad revenue for the Independent.

Xenon-124 has a half life that is exceptionally long (1.8 × 10^22 years ) and observing that decay is extremely rare, they saw it happen, wow!

So if I’m reading correctly, the decay has nothing to do with dark matter, but is super rare and kind of neat that we observed it.

Wow, that's even slower than govts accepting that climate change is a real threat

While it's not what they are looking for, it is still amazing.

Dark matter is a really mysterious thing. If the assumption that it comprises the majority of matter in the universe holds up. We can't find any of it, but apparently we can model it. The map is not the territory.