People with the truth/facts on their side are always eager to present them. When people relentlessly say, in effect, ‘That’s for me to know and you to find out,’ they’re just game-playing. It’s straight up obfuscation.
People are complex enough there can be several to many motivations for that specific behavior.
There MAY be some degree of a TENDENCY in the direction you assert--in terms of group statistics. But that is only measurable with any clarity in group statistics. When one tries to apply it to a given individual, it is very risky and may not be more accurate than chance.