In affirmative ṭibāq, the opposed ideas appear as distinct positive meanings. “Giving life” and “causing death” are opposing acts; one is not simply the grammatical negation of the other.
The mere presence or absence of the particle lā is not a sufficient test. The key is whether the contrast is between two independently asserted contrary concepts or between a proposition and its negated counterpart.
The latter pattern characterizes negative or polarity-based ṭibāq.