Why not debate what they say? Whoever brings up an argument doesn't matter if they have a point, in my opinion. Otherwise it would be ad hominem: https://en.m.wikipedia.org/wiki/Ad_hominem .
Because it's not worth debating to us and the vast majority of us aren't policymakers when it comes to matter of global-economics.
...I suspect the link was to posted here to HN on the off-chance a CTO or tech-savvy CEO of an influential SV company sees it and decides to bring it up at Davos this week - just like how other NGOs take-out ads in The Economist around this time of year. So it's pretty flattering to the HN crowd to imagine that we all virtually rub-shoulders with the world's elite.
I'm applying a heuristic.