Not at all. For example, if someone were to state that Michael Flynn pled guilty and was convicted, it would be strictly true but ignores a lot of context with respect to how the investigation was conducted and where pressure was applied in ways that not only disregarded customary practices and good sense but were sometimes unethical. And I would probably let that pass, having already made my point repeatedly (and now, again). And that would be ignoring a troll that doesn't "fit my side".
Assuredly yes in Trump's case, because there is scant evidence - a trillion trillion search results because people write about it online because they wish it to be true doesn't mean a damn thing. Biden is less easily defended because the deterioration is so marked - the perpetual "calling a lid", the inattentiveness, the infrequent public appearances, the highly scripted press exposures, the easily-provoked outbursts of temper. I go with "age", but when people "on his side" talk and write about dementia, it becomes more credible than if it's just the "Don't Tread On Me" fringe.
Trump is the least warlike president in my lifetime. If Milley does know the man well, Milley knows this. There's no excuse for coming over all Chicken Little on his part, and no reason except playing to an audience and sending virtue signals.