The link to the "BOINC Download Network" is part of the default BOINC server-side webpage setup and we found no reason to explicitely disable it, clearly staing the following at the top of the page:
"These applications are not endorsed by Einstein@Home and you use them at your own risk."
"We do not provide instructions for installing these applications. However, the author may have provided some help on installing or uninstalling the application. If this is not enough you should contact the author."
So you might well contact the author for corrections or improvements.
"The BOINC Download Network is designed and maintained by BOINC.dk as a service for the BOINC community."
That's just what it is. Comments about the collection of the items should go there.
BM

“BOINC Add-ons” - A Complaint
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I just think that the E@H forums aren't a very promising address for your complaints, as we won't do anything about the Add-Ons. So I suggested that you write to the authors of the programs or to BOINC.dk, as this might be more helpful.
BM
BM