Chess is a meritocracy. So is tennis and sales. Anyone can play. The best player wins.
Chess coaching is not. Better coaches might win more or get better gigs, but stuff other than coaching "merit" can play a big role.
But rather than getting stuck in a semantic argument... What the article means is that it's a relatively accessible field, on the way that software engineering is. The formal pathways are not as locked in.
A motivated and talented individual can bootstrap a career without formal education, qualification or approval.
All this is relative to, for example, civil engineering, law, medicine... There you'll need qualifications earned via established formal channels, gatekeepers and such.