They're not touting their superiority. They're just quietly pointing out that by the way they're a nuclear power, and “Look at these systems”.They talk about their systems capacities to defeat missile defences. Well, of course, their systems are capable of defeating missile defences. The missile defences don't exist to defeat their systems. I mean, existing missile defences can't defeat any currently existing systems. They talk about new technologies, but that's for things in the future. They talk about modernization, but so does the United States.
A lot of it is about reminding everyone that Russia is a nuclear power, and some of it comes from a fear of western conventional capabilities. They do continue to see NATO conventional capabilities as head and shoulders above anything they have. They get nervous about it, and then they point out that they have nuclear weapons too.