You really should read the article. The hypothesis is that global emissions peaked last year and so the cumulative emissions graph that you’re focusing on would start to curve downward this year or maybe next. We’ll “see by the end of the year”.
Again, in the article, things are changing wildly fast and you won’t see that yet in a lagging indicator like cumulative CO₂.
The worst effects of climate change haven’t happened yet so I guess that isn’t true either and you’ll go off at anyone who’ll attempt to use the best available information and modelling to predict that.