While this is an obvious/facepalm miss, the protective boot is not a part of the RJ45 specification and is not required for the cable to function in any way. It's only there to protect the plastic tab from being bent/breaking too easily.
In a data center environment, that's less of a concern, as it's just more unnecessary waste/space taken up as well. Most cut the protective boot off or buy cables without, because that boot gets in the way of more than just this router design.
Again, while facepalmy, this isn't as bad as it seems at first glance.
You can buy it off Amazon today. It's not banned.
It's absolute trash is what it is. Ask anyone who's actually read it, and it's poorly written, meandering points that never go anywhere, and a lot of repetition ad nauseam.
It's a very badly/poorly written book.
More people should read it so they can dispel the mysticism that Hitler was some sort of genius evil overlord.
Hitler was a complete dipshit. Read Mein Kampf and discover this for yourself.