Just to make sure the context is clear, my main question is why the article headline says this particular melt caused a 2.2mm global rise in sea level. The melt

Just to make sure the context is clear, my main question is why the article headline says this particular melt caused a 2.2mm global rise in sea level. The melting described in the article would only account for a 1.8mm rise, in isolation. If anything happening in Antarctica had an effect, it would lower that number even further, making it more different from the headline. Does the 2.2mm number include other melting that the article and cited paper don't mention?