Did a hearing mother exaggerates about her deaf son's ability?

Here's a weird story. And a true one.

This is a story about a hearing mother who gushed about her older deaf son who is profoundly deaf and wears a hearing aid. Nothing wrong about gushing with pride about your own kids. What mother who did not express pride about her own deaf child's accomplishments? But this story takes on a weird turn. A revelation into the psychological shortcomings or maybe a case of denial when this mother was confronted on providing proof of her claim about her deaf son.

This claim in question involves the use of a phone and how her profoundly deaf son can use it with his hearing aid on. This hearing mother actually bragged to another person that her deaf son can use the phone with anybody. The person in question expressed surprise and soon turn to doubt. Can he really be that good and freely converse and gab with anyone over the phone? The person in question with moderate hearing loss and wears a hearing aid asked if a phone call can be made to this deaf person so that they both can talk over the phone. The mother refused even though her deaf son is an adult. The person in question tried to be understanding requested than an email be exchanged with this deaf son so that he can make the decision to accept a future phone call or not. The mother refused to pass the word on to her son about the email address or the phone call deal. The story might be moot if the deaf son was not an adult and the mother refused for security reasons but in this case the deaf son is an adult and able to make his own decisions.

Now, is this me or is this is a case of a hearing mother who got caught in a lie (?) when asked for proof of her claim? Whenever a mother that does that does it also show that she is in denial of her son's hearing loss? Or maybe this is a case of an exaggeration gone to far when the deaf son can in reality speak (rather than listen actively, and converse freely) only with a few people the voices he'd recognize and respond in a limited fashion? My take? I think if a mother who does that has a few psychological issues and insecurity that need to be worked out and confronted once and for all.