I hear this and that about the Knicks and most of the time, it is stirred up by the New York media. NYC does not have the NBA pedigree of Boston. They don't have as many historic moments, only one title and their best basketball has been played at various playgrounds. NYC basketball wise is a step down.
I have not heard Tatum,Brown, or Irving say that they love Boston to a large degree. PP used to gush about it. This does worry me a bit.