I happened to be reading through the Syllabus of Errors the other day and reading error #22, I could not help thinking of Bishop Williamson.
Many people I speak to say the exact same thing about how he was imprudent and how he should only speak on matters pertaining to the faith.
Here is error #22 from the Syllabus of Errors.
22. The obligation by which Catholic teachers and authors are strictly bound is confined to those things only which are proposed to universal belief as dogmas of faith by the infallible judgment of the Church. -- Letter to the Archbishop of Munich, "Tuas libenter," Dec. 21, 1863.
So the idea that any Bishop or Priest should not speak on anything but " those things only which are proposed to universal belief as dogmas of faith by the infallible judgment of the Church" is completely false and has been condemned by the Church in Pius IX's Syllabus of errors.
Those who repeat and spread this idea that Bishop Williamson should not speak on issues that he has in the past are simply spreading a condemned modernist principal whether they know it or not.