6 lb snapper cleaned by fishmonger.
What is your question?
Why did it come out so salty? I thought it wasn't supposed to be salty.
Did you scrape the salt off of the skin before serving? I haven't read through the recipe but the method of cooking fish in salt accomplishes two things; it adds flavor, but it also insulates the fish while it roasts/bakes. Residual salt on fish skin will indeed taste salty.
Two points ... Did you use coarse salt ? Table salt will not do it. And, was the fish totally encrusted ? Otherwise the fish will steam and suck in the salt. Did you have the right temperature? I have done both fish and chicken in salt and it works great - no salt taste at all. Do not worry, double check how you did it and try again.