Scott Peck was a pop, almost cult-ish, psychiatrist. Most of his theories, which are largely religion-based, were grounded in his own experience as a psychiatrist and his ideas haven't been supported by research.

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Why do you assume that most therapist use this model? I would bargain that they majority of therapist do not seek to replace love that was never received during childhood, but rather to help a person to cope and deal with the their past/present/future by self re-parenting and knowing that they do not have to be stuck in a generational pattern of maladaptive coping.

Now, how is that achieved? For some, especially those who have a Rogerian therapist, it tends to be through unconditional positive regard, which with the common definition does not equal unconditional love or does not even have to involve love at all.