That's incorrect. The translation quoted by Oppenheimer is actually more accurate than yours. The other two, more popular are:
"The Supreme Lord said: I am mighty Time, the source of destruction that comes forth to annihilate the worlds. Even without your participation, the warriors arrayed in the opposing army shall cease to exist." [0]
"Bhagavān Śrī Kṛṣṇa said: Time I am, the mighty destroyer of worlds, and I come to vanquish all living beings. Even without your participation, all the warriors on the opposite side of the battlefield will be killed" [1]
"The Supreme Lord said: I am mighty Time, the source of destruction that comes forth to annihilate the worlds. Even without your participation, the warriors arrayed in the opposing army shall cease to exist." [0]
"Bhagavān Śrī Kṛṣṇa said: Time I am, the mighty destroyer of worlds, and I come to vanquish all living beings. Even without your participation, all the warriors on the opposite side of the battlefield will be killed" [1]
[0] - https://www.holy-bhagavad-gita.org/chapter/11/verse/32
[1] - https://asitis.com/11/32.html