How could a non alibi be an alibi? If it is not accepted by others then surely it must have occerred to him that it would be a crap alibi. I cannot see any way he could call that an alibi. Has he at any time used the word alibi in regard to the phone call? Or has he at any point used the phone call as a means of defense in order to try and prove that he didn't kill his family?
Of course it's an alibi, his father called him which means he wasn't at the ram when his father was alive, hence, if he was elsewhere, he couldn't have killed him. The fact that it's full of holes means nothing but people argue in support of the phone call quite regularly so, some people obviously believe it and if you think Jeremy is innocent, then you have to believe it. How is it in any way a 'non-alibi'?