The spelling of the word "souled" may seem confusing, as it contains the uncommon letter combination "oule." However, this can be explained through the International Phonetic Alphabet (IPA) transcription of the word: /soʊld/. The "ou" combination in IPA represents the sound of a diphthong, which is a combination of two vowel sounds. In this case, the "ou" in "souled" represents the sound of the vowels /o/ and /u/ pronounced consecutively. Therefore, the spelling of "souled" accurately represents its pronunciation.
Instinct with soul or feeling.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.