I think of it more as, the Marxist Left has nothing to do but politics - 24/7 even if they have a day-job like teaching school. So, they do manage to accomplish a lot.
Trump is an example of what ONE man, who has made it, his whole life in the private sector, can do politically, if he is so inclined.
The author is completely correct about the GOPe, like the Turtle. They have aligned with the Marxists to make it easier, because they could never really make it in the private sector, though they have pretensions that they could.