My understanding of Dirac's monopole hypothesis implies that these results would be very significant for particle theory . . .
As to the sibling's comment from Lindsay LeBlanc, I don't believe that at all. While true magnetic monopoles are allowed by our theories, we just haven't seen any real evidence that they exist, and that's a bit strange. Personally, I don't believe they'll ever be observed.
(I used to be a particle physicist, for what that's worth. Take my opinions at face value!)
I usually ignore implications of immediate world-changing revolution in popular science reporting (they're invariably nonsense in those fields where I'm qualified to come to a definite conclusion), but Nature (and certain other publications) are more circumspect, at least often enough to check first.
Of course, I'm still happy that the results are interesting!
This is a cool result, and it's neat to see a realization of the Dirac monopole in a thoroughly quantum field. But it's not a detection of a Dirac monopole for the usual electromagnetic field (which would be an amazingly big deal, and which I think most people don't ever expect to see).