Kind of sketchy write-up. Second link has a pax video alleging pax were moved from certain seats and there's an odd noise in the background.
https://www.foxnews.com/travel/delta...ency-vibration
https://www.wcvb.com/article/flight-...noise/30462454
I've been on a UAL 747 that dropped a gear door climbing through FL190 out of O'Hare - that caused a significant amount of vibration, but no noise that I recall.