Yeah, they'd notice pesky problems like the fact that increases at that rate are so great that it's not possible to have a period of level temperatures. The temperatures would rise by about .15C every other year, not once per decade. They included a chart that had been "smoothed" so much that this actually looked reasonable but if you see the proper perspective on temperatures 4C by 2060 looks absurd
Swanson and Tsonis are also advocates of significant multi-decadal internal variation overlaying the forced trend. But their recent paper finds the forced warming trend of the 20th century has been a exponential increase.
Effectively without the internal variation they find the early 20th century warming is reduced, the mid 20th century cooling negated and the late 20th century warming reduced.