Hard no. The graph does NOT show the number of users, it shows the number of accounts which is not even close.

It also includes Steemit in the whale section, which does not vote (at least not for the undelegated portion of their stake) and is entirely irrelevant and misleading.

The categories are also pretty arbitrary and all of the bars are large enough that even modest changes in the cutoffs would start to shift a lot of the mass of one bar from one of these arbitrary categories to another.

And finally, none of this really matters for the purposes of proof of brain being preferable to paid votes. As long as stakeholders reach a consensus on payouts which align with value added to Steem then the system works. Whales have at least as much incentive to support that sort of alignment as anyone else. The people who don't have this incentive are vote sellers and self-voters who make more personally by undermining the system for everyone else.