I think “positive” may mean “forceful” (and I think you may be taking it to mean “approving”).
This is still a primary meaning in contemporary English:
adjective explicitly stated, stipulated, or expressed: a positive acceptance of the agreement.admitting of no question: positive proof.stated; express; emphatic: a positive denial. https://www.dictionary.com/browse/positive
adjective
explicitly stated, stipulated, or expressed: a positive acceptance of the agreement.
admitting of no question: positive proof.
stated; express; emphatic: a positive denial.
https://www.dictionary.com/browse/positive
This is still a primary meaning in contemporary English: