The poster concerned, boasted about ordering three pints with a burger, clearly that's not in the sprit of the law, that is not normal behaviour, they were acting to get around the law and stay in the pub longer. They mentioned spoons were serving drinks after people had eaten, and seemed happy about that, despite it clearly being against the law.
No doubt because in their head the risk is no greater in a pub for a couple of hours, with people talking and not wearing masks, thus spreading far more aerosols, than half an hour in a supermarket where most people will be wearing masks and not chatting away. Then there's the fact that supermarkets tend to have better ventilation than most pubs.
I am sick of people looking for loopholes in the law, and pubs & other businesses breaking the law, sure it's shit, but we are in the middle of a pandemic, so suck it up until we start coming out the other side, which hopefully will be only a few months away now.
Frankly, that spoons serving drinks after meals, and allowing the poster to buy three pints with a burger, should be closed down for a month & issued with a £10k fine.