He's using the words "negative" and "positive" in a different sense than a value judgment "good/bad" -- negative meaning "no", "negaton", "nothing", and positiv

He's using the words "negative" and "positive" in a different sense than a value judgment "good/bad" -- negative meaning "no", "negaton", "nothing", and positive meaning "something". In philosophy this is the standard usage of the word "negative/positive", in contrast to common language.