This is sadly true...One of the largest purveyors of misinformation regarding MA gun laws is gun dealers...One even told me that there's no sense in selling pre-bans, when he has lots of neutered guns to sell....
As mentioned in the other thread, some Massachusetts dealers will be reluctant to do the transfer. However, as long as the seller is close enough to make the trip, federal law allows you to make the purchase face-to-face from a licensed dealer in another state, unless that state (like Massachusetts) prohibits sales to non-residents.