I'm looking for an adjective, and I'll use an example to describe what I'm looking for.
John says: "It is impossible to stand on one hand."
When in reality, it is unimaginably difficult (one might also say, statistically impossible) to stand on one hand.* John's statement isn't necessarily wrong, it's just incorrectly "rounded off" the slightest amount, and "technically correct, but not completely".
Someone pedantic could correct John, saying: "Your statement is ____."