This crack is at a very poor location for a long term repair. I'd replace the fender. Since it is composite it will probably be a bolt on install. No welding to show the repair. I'd have the fender painted OFF the vehicle to avoid over spray and 'blending'. Yes the paint might not match exactly but the transition is at a gap between the fender and all other parts.

Ironically, the reason the damage doesn't look so bad is because the fender is composite (AKA plastic). So it 'bounced back' to approximate it's original shape. But the crack shows that the composite was taken passed it's deformation limits and failed.

FWIW we have had two horrendous hail storms (baseball and bigger) this year. Most of the vehicles in stock at the local BMW dealer were severely damaged -- fist size dints every 3-6", windshields and back glass smashed or missing, etc. The X5's looked like thugs had taken baseball bats to everything except the front fenders

Funf Dreisig