I would ask the coach directly about this. There’s disagreement here on CC about soft support at Ivies, whether it exists and how it would work if so. The coach should be able to explain the mechanics and his or her history of getting recruits admitted through that channel.
ETA: I’m in the camp that believes Ivy soft support, while it might help occasionally, is rarely reliable or predictable enough to pass up other opportunities. But I would listen carefully to what the coach says and make a decision based on that.