in which he teaches that vowel symbols are not written in Torah scrolls to allow people to propose different interpretations
The Torah scroll has no vowel symbols (nikkud) so that people may interpret as they wish. The letters, not being marked with vowels, tolerate different meanings, and can break up into many sparks. This is why we were instructed not to punctuate Torah scrolls with vowels. For it is the vowel punctuation that gives each word its meaning, and a word with vowel punctuation has but a single meaning, while without vowels a person may understand many worthy and wondrous things. Understand this, for you will find it necessary on many occasions…
LeDavid Emet, Torat HaShelamim, Torah Scroll Halakha, section 13, p. 48, Moshe Aharon Koegel, Livorno, 1786