Tiny ass wood screws into the sidewall/edge teeth to reinforce. I've found with a delamination of that size is going to need more reinforcement than just epoxy and clamps.
That's what happened to my Al Dentes too. I didin't glue it or anything, just put some silicone there so the core doesn't get wet. Three years and they still haven't fallen apart.
but srsly, i would contact armada bc that shit should not happen even when your hitting rails. Edge cracks/blowouts are on you but a huge crevasse like that should be covered by warranty imo