"Disarm" isn't an official Magic keyword or evergreen ability—there's no rules mechanic by that name. You may be thinking of a card with "Disarm" in its title or text, like the instant Disarm, which simply taps a creature and removes all Equipment attached to it (returning Equipment to the battlefield unattached, not destroying it).
The nuance people get wrong: removing Equipment doesn't destroy or exile it—the gear stays on the battlefield and can be re-attached later by paying equip costs again. Tapping the creature is a one-time effect; it can untap normally on its next untap step.
In Commander, effects like this are niche tech against Voltron decks that pile Equipment onto a single commander. Stripping the gear mid-combat can blunt a lethal attack, but since the Equipment survives, it's tempo, not permanent answer.