Not necessarily. Whether to use Mandarin vocabulary to translate Sichuanese articles depends on the purpose and audience of the translation. If it is for a wider audience, the pursuit of formality, or for some formal occasions, academic research and other situations, accurate translation with Mandarin vocabulary can make the content easier to understand and universal, which will indeed appear more formal. However, if the characteristics of Sichuan dialect are retained, used for the purpose of displaying regional culture, funny entertainment, etc., retaining some unique vocabulary and expression style of Sichuan dialect will be more authentic and more flavorful, and can better convey the charm and characteristics of Sichuan dialect itself. Therefore, it is necessary to consider and decide whether to use Mandarin vocabulary completely based on many factors. You can tell me what specific purpose this Sichuan dialect article is used for so that I can analyze it more accurately.