.... but Ron DeSantis has made a weak point here.
For one thing, these immigrants will likely be shipped to Boston, not on the order of a Democrat, but on the order of a Republican - Governor Charlie Baker. This relocation is also easily justified by the fact that Martha's Vineyard does not have sanctuary status, while Boston does. If this was an attempt to "own the libs," .... it is a fail.
Your last sentence, which I put in bold, spells it out perfectly :
This was a publicity stunt by Ron DeSantis. Nothing more. Nothing less.