The issue is directly linking from FreeRepublic to 8channel. By using a tinyURL, One is not doing so. It is the equivalent of using a VPN connection. . . There is no linkage from FR directly to 8chan. Instead there is a link to TinyURL.com and redirect to the ultimate destination which is a clean page on 8chan where data is posted by Q. It would require further links from there to get to any objectionable material that may or may not be on 8chan.
A tinyurl redirects the browser to the underlying website and page. If that page has p0rn, anti-semitic, or other content that JR prefer to not be associated with, then linkage from FR to the objectionable content exists, tinyurl or not.
A link to some p0rn site won't become acceptable here by referring to a tinyurl in the %lt;a href= entry. I figure the objection to 8chan is similar, and is based on the content.