Not to belittle the impact, but I don't think this is "doom". If even 5 feet over normal high tide makes a difference with where you are on the coast, then you are experiencing frequent seasonal flooding, and are almost certainly getting completely devistated every 20-50 years. Coastal people, that near to the waterline, understand that they're on borrowed time. The time between being leveled will definitely decrease, but it's in the cultural memory in these places. It's not going to be doom, because it's not going to be some unforeseen transient in their experience. They're not going to have structures they expect to be there next winter within 4ft of sea level. It'll be more frequent devastation, with a slow, eventual, loss of will to put up with it. But, it will be slow. A 2ft transient isn't going to destroy anything, except areas that get destroyed multiple times a year already.
Yes, this is one of the areas that are flooded seasonally, and devastated every 20-50 years. To put it into perspective, the tidal range in the pacific islands is around 2 feet. Yearly storm surges go from 5 to 20 ft (hurricane required for the upper range). This is why there are surprisingly few buildings at risk [1]. Nobody builds/rebuilds where frequent destruction happens. People are smarter than that. People will slowly move inland, which is unfortunate to those at the perimiter. But I don't think this is "doom".
Without minimizing the seriousness of what it is... "Doomsday"? For two feet of sealevel rise? (And over 80 years, if rsj_hn is correct?) No. Just no. You have way too wimpy an idea of Doomsday.
That's fine and I'm all for new theories and new models, but let's let them actually make it into the IPCC and see how they are peer reviewed, how the findings are reproduced and assessed by other scientists, etc, especially before multiplying current consensus estimates by a factor of 10. Extraordinary claims require extraordinary evidence, and all that.
given that the melting of the thing could cause ocean levels to rise by up to amost a meter (or even more if it has a cascading effect on other ice masses in the area) that is actually appropriately named.
If you've read the article you will have found the explanation there. The problem isn't the already floating ice, which indeed does not rise the sea level, but the land ice the floating mass is attached to.
Climate change is one contributor to the dynamics of that glacier, so yes it has a lot to do with it, but either way this has nothing to do with your original post, in which you apparently weren't even aware of the fact that the melting of the glacier would rise the sea level which your provided source also states, so I'm glad we have at least made progress on that front.