There are more slaves than ever before, but they are a smaller proportion of the human race
Of course if you're going for absolute numbers, it's hard to beat our 8B population, but it makes more sense to be speaking in percentages.
Doesn't cover anything more than the past couple of decades. That's not 'any time in history', just a very minute and cherry picked segment of it. Go back to the medieval era and before and see what wealth inequality looked like then.
Or perhaps you just didn't bother looking.
https://wid.world/document/inequality-in-history-a-long-run-view-wid-world-working-paper-2024-05/
No disagreement there then, except for which metric is more important.
You better start including serfs and peasants, 99% of the population historically, to those slave number comparisons then. Though there's a good argument to be made they should be included anyway.
Face it, compared to the entirety of human history, we're in a golden age. Things ONLY look bleak when you're looking at recent history. And even then, only in the western world. The rest of us from outside the Anglosphere have pretty much only seen things improving in the past century.