I can somewhat understand a Boston/New England area publication headlining a story on Allen as 'former Patriot'. That piece of information is very pertinent to their audience, readers who are seeking local news.
As long as the article clearly notes early on that Allen spent the vast majority of his NFL career with the Giants and Dolphins, it is not really a contrived controversy in my opinion.
I would presume that New York area publications similarly have headlines of 'former Giant' and Miami area headlines read 'former Dolphin', which is what one should expect.
What I do have an issue with is when a national publication, reaching out to a national audience makes a similar headline to the Globe's. Perusing through the various national news on Allen I found only one site - BSPN, of course - headlining that "Ex-Patriot Allen gets 6 years for Ponzi scheme". Every other publication from Sporting News to Fox Sports to Yahoo to Reuters to TMZ to USA Today has a headline of 'Ex-NFL CB' or something similar.