Not to fet credible, but from a treeline 2km away a properly disguised tank can be pretty stealthy. Same concept of stealth aircraft, yeah if its close you’re gonna see it, but if passive and active sensors can pick it up till visual range, well mighty fine way to sneak a platoon of tanks into an otherwise ‘observed’ area while looking like little more than a couple of civilian vehicles or migrating animals to a radar, or dull spot to thermals.