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No, because Unreliable Narrator only ever applies to the narrator in a first-person narrative. It is not about any character telling an untruth.
Also, it is not possible to "lump together several unrelated tropes under another trope". It's the very point of troping to list tropes that occur in a work with an example text that explains how that specific trope applies.
Edited by LordGroAnd when a character's exposition is unreliable, rather than the story's narrator, then it's Unreliable Expositor. This trope is too often overshadowed by Unreliable Narrator.
^^ No, as in putting them as sub-bullets for Unreliable Expositor (and not as ZC Es), since they all have "if he's telling the truth" in common.
^Right, do NOT do that. See Example Indentation in Trope Lists. If Five-Man Band isn't allowed to do that you certainly are not allowed to do that here.
This signature says something else when you aren't looking at it.As others said, no. Explain in the entries that they may be unreliable and pothole in these explanations to Unreliable Narrator, but no subbullets.
"For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled." - Richard Feynman

A work contains several unrelated tropes (Really 700 Years Old, The Savage Indian, Make My Monster Grow, Glowing Eyes of Doom, etc.) that depend on one character telling the truth about himself, when it's deliberately made unclear whether it's true or not. Can they be lumped together under Unreliable Narrator to avoid a bunch of entries containing a variation on "If the character is telling the truth"?