At what point should we believe in climate change?
When the first islands disappear under the raising sea levels?
When the first cities become uninhabitable because of rising temperatures?
When the first wars begin over of resources that aren't there anymore?
Or when the there are no container ships to bring cheap products from China, or long distance air travel becomes prohibitively expensive, or climate refugees start knocking at our doors? I.e. when it is us who are personally affected?
Most of humankind will select option four, we shouldn't wonder.
Oh, I'm not denying climate change, I'm just saying that we can't say for certain whether or not we passed the Paris Agreement threshold, even though it's likely that we did.
The article that OP posted says the odds that it's not an anomaly is around 80%, so there's still a 1 / 5 chance that this is just noise.