I grew up with the plays they're talking about, there's a point here. The overall argument is that McDonagh is still using the hoary old tropes and trappings that were considered tired a century ago. It's a matter of taste, really, it's a bit like a modern remix of that period of Irish canon. The author compares him to Tarantino and I'd argue that's a fair comparison because Tarantino does the same thing, taking old tropes and concepts, mixing them up, and adding his own sheen to them. Whether that's merely competent, or it elevates the material or it's complete hackery kinda depends on the individual.