I'm the original launcher of the trope, but I'm not here to argue on the grounds of "I own it" (it's a wiki, that would be stupid), but rather to perhaps shed light on the original trope intent. The old name, Jedi Truth, and after that, From a Certain Point of View, conveyed a certain meaning I don't think Half Truth really covers.
I think the distinction is that a Half Truth is a PART truth, in that there in the made claim there is an element of definite, objective veracity. Such as from this Wikipedia example, "'You should not trust Peter with your children. I once saw him smack a child with his open hand.' In this example the statement could be true, but what if Peter was actually slapping the child on the back, because he was choking.
" In this case, the action stated actually happened in reality (hitting a child did occur), but the omission of information reverses the inferred meaning of the sentence.
Consider, on the other hand, the Trope Namer
, when Obi-Wan said that Darth Vader murdered Luke's father. There is absolutely no true claim in that statement, there is no twisted meaning like in the "hitting a child" example. What instead it relies on is words that must be filtered through extremely generous interpretations, extremely flexible logic, and unique points of view to understand. In this case, a the claim (Darth Vader murdered Anakin) never literally happened at all, and it can only be rectified in a (quite generous) symbolic or metaphoric context.
The quote also makes sense AFTER you learn the true intent. Death is a very common metaphor for change, however, unless you're ALREADY operating the assumptions the speaker is making, it's Blatant Lies
. I would say that all of these elements make it separate from a Half Truth
To recap —
"He hit a child" (was saving the kids life)
Is a statement that is FACTUALLY true, but if you know the information the speaker knows, it changes the connotation or meaning of the statement.
From a Certain Point of View
(or whatever we want to call it) —
As inspired by Obi-Wan's quote, it is a statement that is blatantly FALSE, but if you know the information the speaker knows, it makes certain metaphoric or symbolic sense.
(And this is why we don't launch tropes without YKTTW
kids... to save hassles like this. Never making that mistake again.)