Maybe it won’t seem so accurate to you when you realize the baseline in your link is not the 1989 level.

Edit: But you might have a point on the C/F question. I don’t know what Dr. Brown meant. The quoted 9 degrees difference relative to the Ice Age may suggest it’s not Celsius, but even in that case we would barely be at the lower end of the “conservative” range of 0.6-3.9 C rise.