What appalling nonsense. His statement on wealth creation reveals him as a shocking economic illiterate. There is no trickle-down economics theory of wealth. This is another myth used by socialists to discredit the market.
Capital accumulation is how countries generate real wealth.
As a country increases its investments more and more complex stages of production are added to its capital structure. The faster the structure expands, the faster real incomes grow. This is the process that generates wealth and raises real incomes. It's also called economic growth. The idea that capital accumulation is not sustainable is another piece of green propaganda.