Potential client is deaf

Please forgive my ignorance on this subject, but I have a couple of questions if anyone is willing to answer

I was contacted by a potential client recently (I’m a web developer) to help them with their website. I gave them my best advice and they were satisfied and asked to meet.

I asked if a virtual meeting was ok (I’ve quite literally only ever done virtual meetings for my business) and they said “not really, I’m deaf”

What does this mean in the context of an in-person/online meeting? Intuitively to me it seems like an online format might be easier, as we could just type?

Can someone please give me some insight here? :)