It's interesting hearing different views about it.
I took it as a pisstake on two levels. The first, about the super serious adds people have mentioned. The other, of himself and his previous work.
Now that he's free of being Bond (finally) it's no more tuxedos and being super serious, nor drinking champagne or martinis generally made with Smirnoff. Now he can 'be himself', let loose a bit, dance like no one is watching, and drink Belvedere instead. On the rocks because it's smooth enough to not require the vermouth even being waved at it.