No brainer red card for mine. I love watching Diggers play and I hope the 5 weeks off gives him a chance to go away and think about his tackling technique. There's just no need for that type of outcome from a well-coached player. Everyone should know tip tackles are no-go, and coaches and players need to take responsibility to make sure that they don't occur or suffer the consequences.
As a high school coach in the US coach we get a lot of wrestlers (good) who have lifting in the tackle technique ingrained into them (bad). At the start of every season, we have to train this out of them. We do, never had a card in 5 years (touch wood). If we amateurs can manage, there is absolutely friggin zero excuse for professionals, especially ones with form. Keep the red cards and long suspensions coming to get tip tackles out of the game, I say.