So is Dana Shillbank referring to the ink physically on the paper or is he referring to the toxic content of his spew?
Since newsprint ink has been around forever, and the ink manufacturers and newpaper companies would have been sued out of existence by now if, in fact, the ink was toxic, I therefore infer that the toxicity is his own ideological blatherings.
For one who’s made a living as a wordsmith, he certainly could have chosen a better word there, but the meaning comes out as you suggest. More Toxic Millbank.