What’s an “SKS keyserver”?
Its where people used to commonly store there gpg public key, these servers are distributed around the world and synchronize with each other. You can not delete data from them.
The servers that gpg gets pubkeys from.
It talks about magnet links present in the dump, some of which happens to be active. Can a magnet link tell what you are downloading or the file(s) it points to without downloading it?
You can fetch the metadata from peers in the swarm without having to actually download the files, but as far as I know you can’t get the filename without downloading the metadata. Some magnet links encode the filename along with it though.
Yes, magnet links may optionally include a “dn” parameter for the display name.