פירוש על יומא 174:18

According to the precise language, the referenced confession after eating is not the confession during the evening service, since it didn't teach, "Even though one confesses before they eat and drink, they also confess during the evening service." And they do mention [later on] the confession during "the evening service." Moreover, when the Rabbis taught that "the commandment of confession is fulfilled on the eve of Yom HaKippurim, meaning with darkness . . ." this means after one eats and drinks, but the sages advanced this confession to before a person eats lest they become confused due to the meal. Regarding this, they stated that even though they required one to advance the confession, the main confession was not taken from its place. Therefore, one must confess after they eat and drink, meaning with darkness. Now, this is not called "the evening service" in the teaching since the evening service is not proximate to when a person eats and drinks, and "the evening service" has a name to be called by [when they want to refer to it].