Hello, as we know Scrum is part of Agile, and empiric approach which is based on adaptation and learning from expiense
In a past years Spotify has successfully adapted Scrum using their own way of scaling Scrum, particularly the system of Squads, Chapters, Tribes and Guilds which is much less rigid compared to NEXUS, and is allowing higher profits
System is not going against actual Scrum guide, dealing with dependencies between team in its own unique way.