Re: Big John
From what was actually said by Jimbo;
"Andrew Orlowski once trumpted a claim that Wikipedia was "Khmer Rouge in diapers""
Now trumpted isn't actually a word, but I'd say he meant "trumpeted", meaning "To sound or proclaim loudly." That is not attributing the claim to Orlowski. It is saying he repeated and amplified a claim in one of his own articles, in this case from a reader from a comments section.