Wow, what's wrong with burgers? I mean, certainly you can get bad meat, and maybe it's easier to conceal in a burger than in a steak, but ... how about literally all other processed meat that is invariably processed more than burgers? Salami, sausages, hot dogs, ... I personally love burger, and consider it one of the finest foods. Fortunately, there's a very easy way to know the quality of a burger - if they ask you…
The foods mentioned in the article are not an exhaustive list of all the foods for which the government has banned advertising. It's possible they've also banned ads for salami, sausages and hot dogs, but the article didn't mention it.
Probably because, compared to burgers, there aren't that many ads for salami, sausages and hot-dogs during daytime TV, so it's not seen as much of a problem, or as worth mentioning.
But because you mention it - how many daytime ads do you see for high quality burgers, like Honest Burger, as compared to ads for McDonalds and Burger King?