Not to suggest these two gentleman have been drinking, but it’s worth noting that, in Russia, beer wasn’t even legally considered alcohol until 2013. Up until that point it was pretty much just a soft drink like Pepsi. So these people have a different way of doing everything, including throwing down.
In general, squirrels only need to eat about a pound of food per week, and that includes a lot of vegetables since they are herbivores. Nuts are fine but they should also have a balance with things like carrots, leafy greens, squash or whatever else is handy.