That is total crap since it puts a tv in with housing which also contains rent and broadband. Living in UK is going to put the price of electronics higher by 40% but you don't buy a tv every month unlike rent which is 72% more expensive in miami. Will run some maths on it now
Does not matter as its not about absolute costs but cost deviations in % if i have to pay higher prices for certain commodities there is a cost of living difference no matter how often you buy them. And even then a deviation +-10% I would be tempted to say you can have similar cost of living as you can influence by own behavior and it also vastly depends on your family situation. I'd say cost of living between US and UK is comparable.