He has a point, to a point. Unstaked steem and non-voting sp do not split the reward pool.
What is less clear is what people would be doing with their SP if not delegating it to bidbots. If they rented delegation through dlease or self voted, the reward pool math would not change. But if they traded it on exchanges or otherwise kept it liquid or didn't vote with it, everyone elses vote would distribute more.
See my comment.
https://steemit.com/steemit/@blockurator/re-freebornangel-re-blockurator-steembot-experiment-part-2-i-miscalculated-20190415t103838083z#@freebornangel/re-blockurator-re-freebornangel-re-blockurator-steembot-experiment-part-2-i-miscalculated-20190415t151614219z
Right. It matters what is done with the resources sans the tools used to "game the system." If they use alternative means to game the system to the same level and weight, nothing changes. That's the big what-if. And it's a big what-if, because if bidbots did not exist, the same people who are using them now would find another way to game the system. People don't change just because their tools do.
That's certainly enlightening, but there's got to be a simpler explanation somewhere. I think it's unreasonable to expect 100% available SP to be used for upvoting, but I get the point. There is a lot left unused, and it's heavy at the top, SP that could go to grow the platform and pass rewards to more people.