Like all historical thinkers making claims in economics, sociology and history Marx was wrong about a lot of things. So was Smith, Ricardo and countless others. However that doesn't settle the question if there is an updated version of some descriptive or normative claims traceable back to Marx, Smith or Ricardo that is well supported today. Agree?
"wealth would concentrate more over time", which it in fact did and keeps doing, on some measures such as the absolute GINI.
Yes, we should compare the best currently available descriptive models and normative systems. But Masley's claims in the text can then be critiqued for disregarding that there are contemporary thinkers in the marxian tradition who either hold an updated and modified labor theory of value informed by contemporary evidence or hold a marxian view that does not rely on any labor theory of value at all.
Lindsay does not adhere to basic honest critical inquiry. Marxism deserves much better critics!
As a sample this text by Matt McManus shows some of the deep problems with one Lindsay's books https://archive.is/psCEw
"wealth would concentrate more over time", which it in fact did and keeps doing, on some measures such as the absolute GINI.