If one takes a moment to read
the study and
its supplement, one finds that what has been stated/found is that the models used over a decade ago overstated the rate of warming to the extent that the goal of limiting the global temperature increase to 1.5 degrees Celsius above mid-to-late 19th century temperatures is achievable and it appears the world has about twenty more years than earlier models forecasted to achieve the objective.
What does the study not say?
- It does not refute that the Earth is warming.
- It does not refute the impacts of the warming.
- It does not refute the anthropogenic etiology of the warming.
It says it appears we have about twenty more years to "get our act together." In the scheme of planetary events, that's not a lot of time, and as any 60 year-old will attest, its also not a lot of time in scale of human events. That's important because with global warming, the point of no return is exactly that, unless it happens that we have mastered "really quick" planetary-scale terraforming by the time that point is reached.
It's much more nuanced than that. The original projections back in the 1980s were apocalyptic. Largely because Climate Science was a "pretty new thing" having been given all that fancy instrumentation and satellite capability that they NEVER had before. And whenever you give a science a lot of new tools, they tend to abuse them at first.

(another story for another thread)
So -- right off the bat, these folks were cast into fame and fortune as the money and press attention multiplied
and they EXPOUNDED on all things that COULD happen. They conjured up stuff BEYOND the basic Physics and Chemistry of the Atmosphere and the GHouse effect.
They told tales of Runaway Accelerations, Irreversible Trigger Points, and Net Positive Feedbacks. Scared the living SHIT out of the whole world. Built all these trippy "maybes" into most of their modeling for the next 40 years.
Well -- where I've been on this for 30 years is still the same. CO2 has LIMITED POWER to increase the surface temp at equilibrium. Pretty much confined to the basics of GHouse science without the elaborate Media attracting "trippy dreams".
And 40 years LATER -- all those "expanded powers of CO2" have not manifested. Have not materialized, Have not been measured.
Why this new declaration is amazing is -- it SHOULD have been declared about 10 years ago. But it was embarrassing to comment on the failure of what skeptics call "CATASTROPHIC Global Warming" theories. THAT turkey is in the oven and almost done. THAT'S the significance of this "revelation"..