Wait, thinking back to the first part: Yvm could be Atbash to Ben, as we saw. So the phrase might be "Ben Daphne D52 Dad". If we take that, maybe "Ben Daphne D52 Dad" is a message where each part has meaning. D52 could be a model number. Dad is the father. Maybe the father is named Ben, or the model is related to a father figure.
Looking at the rest of the string: Daphne D52 Dad. Daphne is a name. D52 could be a model or a model number. Dad could be a title or part of the puzzle. Maybe "Daphne D52 Dad" is a name code or needs to be processed similarly. Yvm Daphne D52 Dad
Y (25) shifted back by 16: 25 -16 = 9 (I) V (22) -16 = 6 (F) M (13) -16 = A (since 13-16 = -3, add 26 to get 23, which is W? Wait, maybe I should use modulo 26. Let me redo that. For shifting back by 16: Wait, thinking back to the first part: Yvm
Alternatively, maybe "Yvm" is a typo for "You've", so "You've made Daphne D52 Dad". But that doesn't make immediate sense. Let me think about Daphne D52. Daphne could be a name or a code name. D52 is a model number, maybe a device or a game. The term "Dad" at the end is intriguing. Putting it all together, maybe it's a puzzle or a cipher requiring substitution or other cryptographic techniques. D52 could be a model number