Very unsubstantiated. From the sounds of it, it was Rivers or George after some interpersonal stuff with Rivers' daughter. I think Harrell will probably be gone as well as he was the other rift in the lockerroom.
The Clippers can't trade George unless they are getting another superstar back. The main team I thought made sense was the Sixers with Embiid, but the Sixers just hired Doc Rivers, a coach notriously ignorant about modern play style and tone-deaf regarding floor spacing issues. I think this signifies that the Sixers won't trade Simmons or Embiid in the near future. They may look to trade Horford, but he isn't a significant piece anymore. I also wonder if we could see a Paul-Rivers reunion, with Embiid/Simmons playing the Jordan/Griffin role.
The Clippers have repeatedly been creative with their roster construction. I'm curious what move they will make, because i don't think Harrell-Williams-Zubac-Morris-Beverly is a good enough supporting cast, unless the Clippers hire D'Antoni and his creative scheme.
TLDR: I think this hiring indicates neither the Clippers nor the Sixers will be trading superstars this off-season.