According the Bureau of Economic Analysis, that may not necessarily be the case. Agriculture and retail trade, the stuff you mention laypeople purchasing, contributed nothing to less than nothing toward economic growth in the first quarter of 2026. Cars and maybe sofas fall into the durable goods manufacturing category which was the fourth highest contributor.
The top three contributions came from information, the federal government, and professional/scientific/technical services. I don't spend a lot of time keeping up with the finances of those sectors and I'm not an economist so take my words with a couple grains of salt, but to me those things mean an increase in data centers, federal spending (and my guess is not on things useful to a layperson), and services that often end up being business to business transactions.
Obviously there is a place today for companies to sell to the masses, but the comment you responded to was discussing economic growth, and at least to my eyes it looks like most of the growth is indeed going to sectors primarily controlled or benefited from by the wealthy while sectors supported by the masses either contributed less or shrank the most out of any sector in the case of retail trade.
If that trend continues long-term because of a decreasing population then I think that's fine, but if it continues due to a lack of investment because of low profitability, then I think there will be (more) issues.