I just did a search of the Providence newspapers and tv stations and couldn't find a thing about this, other than the article you posted. Seems curious enough that there would be something. Are you in the area? Keep us posted, especially if they every explain the "language problem".
I'm not in the area, I'm in Chicago. I was just googling some of the search terms that I use looking for unusual news stories.
The first story of the witness seeing the guys breaking in caught my attention. Then curious is as curious does, I googled the lighthouse and came across the Russian scientist who has pictures on his website of the lighthouse and power plant that I assume is nearby.
I tied on my tinfoil hat and put Pomham lighthouse in as a google news alert. Stopped in my tracks today when another incident came up so soon.