Maybe the title should be updated. It doesn't have anything to do with decentralization per se, but about cryptocurrencies, which is just a technology that happens to use decentralization as a technology. I actually thought the article was gonna be about decentralization (as in P2P technology, like BitTorrent), but instead it's about the authors distaste for cryptocurrencies. Edit: Maybe it's just me, but the article…
Framed as such, this seems more like an impassioned technical rebuke from an informed individual than a "conflict of interest."