My family members have experience with deafness. They've had direct first-hand contact with someone who is deaf in one ear, and have learned how to interact with that person successfully. They are familiar with the challenges of being deaf (in one ear, least), both from having interacted with the person, and because the person in question has explained the challenges they have faced.

I have lived experience with deafness. I've been deaf in one ear for decades now. However well I explain myself to my family members, there is a degree to which their experience will never be the same as mine, despite their first-hand contact with me.

We can either reserve the word "experience" for me, and try to police it so that nobody can say they have experience without being prepared to demonstrate the first-hand nature of their experience, or we can understand that people will use the word to mean "prolonged exposure" or similar, and add a qualifier when important to people like me: e.g. I have lived experience as a deaf person.

The word "experience" encompasses many kinds of contact, which is why it is often modified in various ways. It is not redundant to say "first-hand experience" or "direct experience". These are commonly used and broadly understood. There is no reason "lived experience" should be any different, and indeed I think it is more of an anti-woke shibboleth to make fun of this than it is a woke shibboleth to use it. Normal people with no skin on either side of that game understand it perfectly well.