Basically, Christ' assumption of human nature did not bring in a human person. That would cause Jesus to suffer from a Dual Personality Condition, akin to Schizophrenia.313. The God-Man as the result of the incarnation. Christ is not a (Nestorian) double being, with two persons, nor a compound (Apollinarian or Monophysite) middle being, a tertium quid, neither divine nor human; but he is one person both divineand human.
7. The anhypostasia, impersonality, or, to speak more accurately, the enhypostasia, of the human nature of Christ; for anhypostasia is a purely negative term, and presupposes a fictitious abstraction, since the human nature of Christ did not exist at all before the act of the incarnation, and could therefore be neither personal nor impersonal. The meaning of this doctrine is that Christ’s human nature had no independent personality of its own, besides the divine, and that the divine nature is the root and basis of his personality.
Propitiation PSA advocates are OK with all that because then they can appeal to their alleged Christ's Human Person to justify Propitiation.