Odd that you got his name wrong. I'd might try to take issue with your comment 'that ownership as a social group cannot help itself in making the lot of labour progressively harsher' but since ownership as a social group doesn't seem to make much sense, that's difficult. Further you seem in the idea of 'cannot help' be implying an inevitability that Varoufakis doesn't ascribe to. Indeed your OP has a note of pessimism in it which seems a misreading of the article which is quite balanced in its approach.
As to the evidence - it's odd that you ignore that this seems a recent move as opposed to the 2011 report and using one data point as a tend as you appear to do here isn't evidence of a thesis of trending inevitability. Perhaps you need to lay out your ideas a bit more thoroughly and clearly.