What's wrong with cow paté?

So yesterday I read this in English for Journalists (Second Edition), by Wynford Hicks:

If your house style includes accents, make sure that you use them consistently. For example 'paté' and 'emigré' are howlers; they should be pâté and émigré.

And then today I saw this Rick Brookes cartoon in Metro (click on the image for a larger version):


(Incidentally, the picture above is actually a screenshot from the free electronic edition of Metro. For me, the main advantage of the e-edition over the print edition is that the text is searchable.)