I'd like to see how it compares to https://github.com/amethyst/specs, a rust-based ECS engine, for use in the multiplayer voxel world game Veloren (https://veloren.net), or https://github.com/TomGillen/legion
Basically an ECS is not really a secret easy pattern to cache coherent data access. This benchmark shows its fast for the easy cases but says nothing about typical game requirements.
Also as a claim I also find this highly doubtful particularly as I’ve been working as a game developer for many years and not really seen it used on a single project in that time. There’s a reason why there are dozens of hobby implementations but no full scale games written using them.
Looking at that it has way more in common with an OOPish inheritance/composition approach to entities than the ECS view of an entity being a primary key into a data store of components with a pipeline of systems acting in a component centric manner to update the game state.