I can’t add much, but you should take a look at this fencing recruiting thread that has been going on for years. Would your S be a 2023 HS grad?
Also, do note that college fencing scholarships are limited…I would advise you to not go in thinking that fencing will pay for college in the US. Most fencing scholarships are partial, and are a percentage of tuition, say 25% or so. Will you qualify for need based aid at US colleges?