A website should never be tailored to those who already know about it!
But I certainly agree, this one doesn't seem to be as clear as it could be.
My guess is that it would be of greater benefit to those with more experience.
The home page says An Intensive Training & Performance Program
For Musicians & Advanced Music Students
Looking at the program it seems to me that an early-intermediate level performer (which is what I would consider myself to be also) might not get a lot of benefit simply because we're still looking at rather basic techniques.
I'd write to them to clarify, but my gut feeling is that it would be a real struggle for an early-intermediate player.
You might want to check out Summer Keys. Sam S who participates in this forum has been there a few times (if you search for Sam S under user names, and then click on his posts you can find where he discusses his experiences)
Here is a link to the sitehttp://summerkeys.com/2012-piono-workshop/32/
It clearly says that your experience level is not important - you can participate as a beginner even!
On the other hand... The Amalfi Coast is a stunning place, well worth a visit just for its own sake! With the added bonus of the experience of performances in churches and palazzi ... that would be pretty exciting.