(24) The mesiach Ifi tumo referred to here is a case where he did not explicitly come to provide necessary information. For example, he is speaking with regard to other matters , and indirectly provided the information needed. In such a way is he believed. How much better if he knows the customs may he be believed since he is an employee and wants tofulfil his masters wishes. However if he has ulterior motives, such as wanting to be favored by a Jew, we don’t accept his mesiach Ifi tumo. If there is someone walking in and out we don’t even need mesiach Ifi tumo, as is how the Rema ruled. The reason a non-Jew is believed with mesiach Ifi tumo is because the prohibitions here are of a rabbinical nature. In a case where meat has been cooked, and you are unsure whether it had been salted, the meat is permitted for the same reason i.e. that is a doubt in a rabbinical law. It can also be said that there is a chazakah that in the majority of situations one will have surely salted his meat. A rov is stronger than a chazakah.
(25) Even a simple child is sufficient.