If a work is entirely hosted on TV Tropes as the only source, then we would be compelled to link to it without any evasion. If it originated there but has an offsite link that is regularly updated, we should default to the latter. If they have a mix of material on and off their site (like their Pantheon round-robin, parts of which are hosted offsite), then one link to the TVT site content, and a link to the offsite material on the same page, stating which is which.
That's my overall take on how this should likely work.
That's my overall take on how this should likely work.