What part confused you? If I can clarify I will.

You just seem to be making many negative claims with little substance behind them.

I don't understand what you want; it's all true as far as I can tell, do you want a detailed technical breakdown of the protocol in an HN thread? This doesn't seem to be the place but the graph protocol mechanisms are pretty easily verified from their spec

These claims seem pretty basic and are easily read about in their Wikipedia article, https://en.wikipedia.org/wiki/Matrix_(protocol)