Interesting idea, but elevations lower than 50m or so are colored black as if they're water. Looks like an apocalyptic flood. Don't understand why the author didn't make sea level a clearly visible threshold.
I somewhat like the map precisely because of this fact.Waters and oceans are not at the end of the day solid, however vast they might be(however this is not to say this map is fully about elevation, because underwater elevation is mostly missing if not existent).Though it might look unnecessarily apocalyptic, it's somewhat a good reference of how the tectonic plates, the planet, and everything else in nature evolves.I'm personally fascinated for example by the both 'negative' (rivers) and 'positive' (hills, pre-mountain areas) that form tree-like structures.If we used traditional elevation map such quirks would be less noticeable, at least in my opinion
It's just a strange choice given that the author is lamenting about how traditional relief maps don't represent both coastlines and high mountain terrain well... And then proceeds to not represent coastlines well, even though that would definitely be possible with their approach.