They've only played two matches, and their first win against AC Milan was quite significant. However, I don't think we should be too quick to speculate too much, as a newly promoted team shouldn't be able to pull off a surprise or compete for the top spot. I think Cremonese will be the same this season.
As for Jamie Vardy, there's no doubting his quality, but he's getting very old now, at 38, and he can no longer contribute to his full potential. Perhaps his experience alone can have a positive impact on the Cremonese players.
It seems to me that this transfer has more benefits for Vardy, who will continue to play in Serie A, instead of going with Leicester to the Championship. And for Cremonese, I don’t see much benefit here, because you are right when you say that Vardy is no longer young, 38 is a respectable age for a forward, but on the other hand, there are quite a few players in Serie A who continue to play at that age, we can remember Modric. Cremonese is not a rich club and tries to look for players according to their financial capabilities.