The CTCP request sent over an IRC server for a DCC connection is only to send the request and bootstrap the connection in a convenient fashion; it has little to do with DCC itself. You can easily send/receive DCC connections without IRC if the receiver (or sender with passive dcc) knows the destination ip/portWikipedia
Another way to initiate a DCC session is for the client to connect directly to the DCC server. Using this method, no traffic will go across the IRC network (the parties involved do not need to be connected to an IRC network in order to DCC).
Note that here they may be talking about mIRC's dcc server functionality, but you can do the same thing with any two agreeing clients, even without the dcc server protocol extension.
In any case, I'm not sure what the relevance of the request is to this suggestion.