To a JW "the truth" means the WT religion and its current teachings -- no more, no less. Whether it's really true or not is irrelevant.
The phrase is a surprisingly effective thought-stopping device. Once you equate the WT religion with "truth" then everything else must be false -- no further thinking needed or allowed.
A lot of XJWs still use the phrase, even when they know better: "I was in the truth 23 years... How long were you in the truth?"
The WT phrase "present truth" is an even more bizarre thought stopping device. What it means is "present UNDERSTANDING -- the current teaching of the GB, which is always subject to change when they get 'new light.'" Of course, if what's currently taught is actually wrong, then it's not truth at all, but JWs are strongly dissuaded from thinking that deeply. When it comes out of Bethel, it's "the truth" until further notice...