Sure, I realize there are tidal forces, wind/current considerations, even local variations in gravity. But what they are talking about is utter nonsense. If the *apparent* rise is faster in one place than another, it is probably due to local relative subsidence of land, not rising seas.
It’s because the earth is tilted on an axis, you see, so the water level is higher, you see, on one side of ocean than the other, you see... ;-p achachacha!
Isn’t the city of Boston already pretty well protected from storms by the bay and the islands in the bay? If I had to guess at it, this is probably why the people who settled Boston chose its location - because the bay is a natural shelter from storms.
For the rocky areas, mostly it is the shifting of currents as they point towards different areas of coast-line. It’s a lot of what causes ice shelves to lift and break off in areas they’ve been stable for decades. Water in a still pool levels at the same height. Flowing water can form low “hills”.