It's hard to understand for non-crypto specialists. It uses notions which are unknown to most programmers like MAC or other *MACs.
So not sure who is the target audience for this.
This is of course bunk, because the boundary layer and level of abstraction matters, and the apparent target audience for this content marketing piece is any developer that might fall into the trap of assuming otherwise. The selection, integration, and configuration of cryptographic elements into an application carries as much significance for the strength of the resulting cryptosystem as the cryptographic qualities of the elements themselves, especially when considered by an attacker that seeks to drive a wedge into any gap available.
The article is obviously far from a comprehensive survey on the topic but does zero in on a few of the practical cases for hash functions, although you're not obliged to necessarily draw the same conclusions since (as the comments in these threads reveal) there are more alternatives than those directly discussed.
Eg it’s very to-the-point, doesn’t spend all its time talking about how the professionals are awesome and better than you, and gives actionable recommendations. Most “don’t roll your own crypto” articles don’t do that and just come off as being elitist, and don’t actually _help_ the reader.