This so-called vast library of insulting images does not seem to be any worse than the library of insulting images held by the new york times and other left wing outlets here in the USA. I consider the NY Times caricatures of GW Bush to be even more adolescent.
Sounds like an attempt to link usage of caricatures of our dear leader to soviet style disinformation/manipulation. Always accuse the other side of what you are doing yourself.
Funny thing is the Guardian newspaper is left-wing/liberal in political orientation.