Mendes Brothers reffing scandal at Pans 2017 — was it actually rigged or are people salty?

Multiple rounds where Mendes-affiliated black belts won by referee call against Atos and Alliance. The video clips made the rounds for years. Some say obvious bias. Others say IBJJF rule misreadings get magnified online. Higher belts who were there — what actually happened? Was it a real scandal or did the internet narrative outrun the truth?