If my memory serves me correctly, that was the stated reason.
A local broadcast doesn't cost a lot of money - you can purchase the gear necessary for less than $600 and an audio Internet stream for about $100-150/year (plus the cost to hire a broadcaster - most of us in the minors work solo. To do home games only, the cost of hiring one extra game-night staffer is pretty minimal, but it is a cost).
However, a minor-league broadcast doesn't generate a lot of ad revenue and likely isn't a big moneymaker. I believe the AHL requires a feed with PXP for the AHL.tv service, but as long as the visiting team sends a broadcaster, that requirement is fulfilled. Every other team in the East has broadcasters who work home/away (A couple of the West Coast teams might have ones who do limited travel, but I'm not 100% certain, but those teams almost never play outside of their division).
I believe the P-Bruins let their announcers go near the end of the 2016 season, so this is their third year without a locally-produced broadcast. Their last PXP had a similar path as yours truly, working up from being an off-ice official to helping with media to the PXP booth.