George Kittle is not at a voluntary San Francisco 49ers practice (i.e. one he is under no obligation to attend). You can take that for what you will.
Where some people have taken it is that the Pro Bowl tight end is taking part in the tradition of holding out of voluntary OTAs while seeking a new contract from the Niners. The strongest indication of that was a report from The Athletic's Diana Russini, who reported Wednesday that Kittle wants to be the NFL's highest-paid tight end.
Kittle responded on X, saying that Russini's source is incorrect.