I would never rely on broad-based information pages. One has to drill down. There are many people initiating chargebacks when the vendor (in this case a hotel) is open & providing the service, but the consumer cannot or does not wish to travel. In that case, a flexible COVID-19 policy offering a rebooking or credit for future use for an otherwise non-refundable booking is more than adequate.

On the other hand, if the vendor is not offering the service at all, that is a horse of a different color.

If you look at the various threads on the topic, you will see that the people who provide the clearcut, factually precise, and well-documented chargeback requests, almost always prevail. In your case, the property has told you that it will not provide the service. Properly documented and kept to 1-2 short sentences, a chargeback ought to be relative clearcut, e.g. "I have a prepaid reservation for May 31, the property has advised that it will be closed and unable to provide the service I paid for, and it has refused to refund my funds."