I doubt that extremely highly. Why wouldn't they let everyone watch if they could? Whats the upside for restricting access to those with a cable subscription? It just throws away possible ad revenue.
My guess is that they aren't allowing it to cord-cutters, because they get more money from TV providers if they don't allow it. But there's a difference between agreeing to reserve access to cable subscribers, thus increasing their revenue, and not being allowed to provide cable-free streaming. My understanding is, since the owners agreed to allow in-market access to games, only 3 teams have held out (O's, Nats & Dodgers). The Dodgers situation is a result of some kind of convoluted tv rights situation throughout the LA area. MASN seems to maintain blackouts, just because they want to. Given the struggle between the two MASN ownership groups, I would think someone would have reported on any kind of restrictions that weren't self imposed.