Re: I'm not an expert
If the current temperature variation is within the range of what has happened naturally in the past, then it is statistically insignificant.
If what is happening now is shown to be in line with what has happened in the past, then there is no reason to the that what is happening now is due to some new "unpleasantness".
Or put another way, if we can explain the current temperature variation we do see as being down to the natural historical tendency for temperatures on Earth to vary over time, why would we need to think up any other reason to explain it? Occam's razor.
The conclusion quoted above seems to be saying:
"The present variation we are seeing is nothing outside of historical norms, and does not indicate a threat to the stability of the ice sheets. But if there were to be more temperature change in the future at a rate that was faster than the current or historical norm, then this could be bad."