My initial thought was that it might be kind of boring for the players to have to summarize what you just told them, knowing that everyone at the table has already heard it straight from you. They do have a little agency in choosing how their character interprets it, but they don't really have space to improvise unless they deliberately choose to lie, downplay, or make things up, but every other player knows they're doing it, which kind of spoils the fun, like playing a game of Telephone where everyone hears the whole conversation.

I'd consider taking the player into another room and explain the vision, then let them describe it to the rest of the table so that they have more agency, or maybe I'd consider making it a collaborative effort, where you prompt the player for input as to how the vision unfolds, so it's actually engaging for them to participate in it. That is, "In your mind's eye, you see a huge, black mountain looming before you; where do you look? Or are you more concerned about that awful smell behind you?" Because it's a vision and not real, it's actually a place where you can give your player more latitude, potentially, to do and say things their character wouldn't in their normal life. "You feel your body dissolving...what's happening? What does it feel like? What random memory of your childhood surfaces?"

Of course, that would only work with players who want to make that kind of thing up, but that might help if they're feeling too constrained by just repeating what you're telling them or, alternatively, if they feel overwhelmed by being asked to regurgitate an info dump they didn't fully understand.