The butler's explanation was actually a prearranged agreement between Redio and Kieren to facilitate mutual visits.
Kieren had always been a minstrel, and he remained unknown in the Royal Capital for a long time before coming into prominence, so it wasn't surprising that he had received help from someone during that period.
Moreover, to make the whole affair more credible, Kieren would occasionally send some wealth to Redio, and Redio would often "borrow" money from Kieren.
This was also why the butler looked at Redio with disdain.
However, Redio did not care, as intelligence personnel were unconcerned about such matters.
He walked straight into the banquet hall and, indeed, saw Kieren and Silver Hand lively conversing with a group of new nobles.
The term "new nobles" was used to distinguish them from the old imperial nobility, who had already lost their influence in Lion Heart Castle.