How much of this is American disinformation. And ukraine disinformation.
Less than your post is Russian disinformation.
It could be the days of tanks and similar vehicles are over no matter who makes them. It happened to the battleship.
On the other hand the missiles have performed, just as they did in Syria. It seems countries like India, China and Russia have placed increased emphasis on this area.
The US is behind in this area but we did have a successful hypersonic missile test not long ago, so we’re probably closing the gap quickly.