The wording in the opening post seemed vague and misleading each time I read the words. Let me explain. While the wording stated the nut was stripped, and possibly it was, more likely the nut was fine, as we learned when a qualified tech simply removed the fastener.
I suspect the head of the fastener, very possibly a Torx style since no drilling was mentioned, was rounded out, not allowing the Torx bit to adequately securely lock into the fasteners head.
The trained mechanic with a proper spiral easy out, likely positioned the easy out into the damaged Torx opening, without drilling anything and simply unscrewed the damaged fastener.
The actual nut itself was never stripped or replaced.
Overall though, the best lesson learned in a post such as this is seeing the original person learned and established the limits of their tools and ability. Then wisely obtained skilled help. So many times internet forums or FB groups offer up many sorts of credible advice, that is accepted and worked by unskilled hands that go too far, causing extensive complications.
So I applaud seeing qualified help utilized, not apparent damage done and the armrests are now installed.