Nah, blanket statements like this aren't helpful when there's good alternatives out there.

There's some crabs and lobster that are sustainable. Florida/Caribbean Spiny Lobsters from the US warm waters are fine and so are Californian ones from birth the US and Mexico. Squat Lobsters/Langostinos are fine.

Chesapeake Blue Crabs are fine, but in the Atlantic there's some fishery issues with Diamondback Terrapins bycatch. Asian Green Crabs are invasive in the US and probably should be eaten anyways. Alaskan crabs in general are sustainable and have no problems too- but the fisheries are currently closed for their Snow Crabs ans both Red, Golden and Blue King Crabs. Dungess Crabs on the Pacific Coast are fine too.

European Lobsters are fine too, and are the same genus as American ones too. There's also an accidentally introduced and invasive population of American Lobsters in Norway that you can sometimes find on the market.

Confusingly, Norway Lobster are a prawn, and are a mixed bag. Oh and Rock Lobsters are fine too. Yes it's an actual animal, not just a song. They are a type of Spiny Lobster.

Tldr- just don't buy crab/lobster from New England and Canada if you're concerned about the North Atlantic Right Whales. If you want more info on overall seafood sustainability, just look at Monterey Bay Seafood Watch