Primal Strike, Primal Bond, Wendigo Totem mentions “Primal Hunger Spirit”, so I agree Berserker + Shaman (“when conjuring their primal powers”) should be Primalist out of these options.
Occultist mentions “the mystical eye” on Blood Burst. Occult = secret, not divulged, hidden, and mystic = mysterious, full of mystery / mysteries of faith (“powers granted by the three witch ‘gods’”) / "“pertaining to occult practices or ancient religions” / secret rites (Second Rite! “Deepens their bond to the hidden realm”).
I would swap them so:
Berserker + Shaman = Primalist
Berserker + Occultist = Mystic