I understand why you want to take over the listing from your point of view as a business, but it is against airbnb’s terms and is not terribly fair to guests who booked based on the reviews and ratings of the current hosts.
@AlexSJ I feel isn’t giving the best advice here (to say the least). If Airbnb find out what you have done they could cancel your profile and you would put your other listings at risk. Is that something you want to do? In any case Alex and the new owner are not correct.
You can’t just ‘update the information’. It’s not a matter of simply changing the number and email. What about photo iD? what about payment methods and address, all linking up. If it was as simple as Alex and the owner make out - this sort of thing would happen much more often.
@Arlene_Larsson is correct as a host you can snooze a listing and still communicate with guests. I did this recently. In Arlene’s case it sounds like what happened is the original hosts snoozed the listing. Then made an arrangement with the new owners to take any bookings during the handover period when the original hosts still had bookings but the new owners had moved in. (Perhaps to save the existing owners paying cancellation fees and having cancellations show up on their profile).
Honestly - I would take the ethical approach here in line with the procedure @Caelleai outlined. In this way you will get most, if not all, of the bookings in hand, but you are being honest with your guests and you don’t risk being banned by Airbnb and losing your Airbnb business.
When you set up your new listing you will get a boost as a new listing and guests will be able to see reviews at your current listings which will give you credibility.