Hi, cookie,
aspria’s comment now has me worried. If we resolve the clash in question to give the name of the creator, then the three-word phrase contains a spelling error, so it does not, in the strict sense, “appear in the completed grid”. As we are required to choose one of the two clashing letters, we can’t have both the creator’s name and the phrase in the completed grid at the same time. I suspect that this is deliberately thematic.