Well Christopher Tolkien was 'silenced' by the fact of his dying at the age of 95.

The article in my opinion unnecessarily links JRR Tolkien's views on the monstrosity of cars with the much later conspiracy theory that car-free zones are an attempt by the UN to limit personal freedoms. TFA does itself make clear that there wasn't a connection but if it was me I wouldn't have mentioned it in the first place, when there is so much more interesting to say about Tolkien's own views on modernism.