The point here is not which year was the hottest but the incorrect research that said a recent one was. An additional point would be the big deal the alarmists made when the first results came out and their silence on the correction.
Your recollection is incorrect, "hide the decline" is found throughout the source code in the CRU archive leak (quoted like that in comments and directly expressed in the code). There's also the green line in that IPCC graph that just ends in the middle of a thicket of intersecting lines. If it had been continued, it would have ... declined. It's a pretty big deal since it throws into doubt the entire tree ring approach (not to mention the explicit or implicit fraud).
Agreed on the "casts some doubt on the alarmism", although I'd say more than "some", since they went to some effort to disappear it in the first place.
Hmmm, maybe I should ask, "Warming tend over what period?"
Since the last Ice Age, obviously. Since the Little Ice Age, certainly. Beyond that? The time series of data really matters in this debate, for if recent increases do not correlate with anthropogenic CO2 increases (e.g. if it got warm in the 20th century before that was big, and now is getting cooler) then it calls the whole alarmism crusade into doubt (at best).