Can you remember when he appeared last? If I am not wrong, I didn't see him in Eid Al Adha prayer. I didn't see his sons either. This means he was sick for long time. We heared about him after his serious condition.
His last public appearence https://www.instagram.com/p/Cfx7iwopJkq/?igshid=MzRlODBiNWFlZA==
9 July 2022, Eid prayer
His sons appeared at Zayed bin Surour's wedding in March