Edit: The lines on his palm are very clear though in the whole picture: https://www.merseyside.police.uk/news/merseyside/news/2021/m... Maybe that was it. Those are also pretty unique.
Although, come to think of it, it is in fact perfectly possible in theory to recover information from out-of-focus images. In practice it tends not to work well due to noise, but it's theoretically a reversible transform if you can deduce the blurring kernel. I highly doubt it would work well on a social media JPEG, however.
the edges seems to be restored fine on that image - this is exactly what you'd need for fingerprints.
Also, the image have clear partial palm prints which police may have had in their db on this guy too.
Plus, the point is that the picture is not a blurred picture of a finger. There is a lot of information in this photo which could be used to help to guide the de-blurring process.