Considering that Eth2 also have about 7 clients that work today (with more being worked on), the specification is clearly understandable by at least 7 different entities, further eroding the argument that Eth2 specification is so complicated no one actually understands it.
Most of the linked spec is pseudocode - actually it looks like valid python code. So to be fair I highly doubt you'd need any understanding of what it's actually doing to successfully implement that spec. Just like I still have no clue how Quaternions work, yet I've implemented them multiple times.
