Hello; The silicone is likely going to be inert although I do not have real knowledge of that. Being soft and without sharp edges ought to mean it will not tear the gut lining. Here is another unsupported guess, that the object appears to have actually gotten into the digestive track might indicate it is small enough to pass. There is another active thread on the same issue. That member's cat has an object back in the throat for a couple of days. seems it may be too big to swallow. It can be seen behind the gills.
Good luck wish I had a better suggestion