Of course, though I wasn't arguing that it was the FULL power of Imperiex, only that it was AMPED by Imperiex and using as much energy as possible.
So, as I showed before, Brainiac 13 had the full power of Imperiex and explictly was using it to amp himself/Warworld as Warworld was his body at that point. Relevant quotes:
Brainiac 13, renegade electronic consciousness from the future, has through stealth and subterfuge quite literally stolen the essence of Imperiex and made it his own.
"This planet is my body, the Imperiex Energy is my blood. You cannot hurt me."
"Maxima's attack on Warworld was quickly disintegrating in the face of her own arrogance and Brainiac's overwhelming, Imperiex-stoked Firepower."
"
While Steel's inexperience did not allow him to fully tap into the Entropy Aegis' potential, he could still harness enough of the Imperiex Essence to counter the same force as deployed by Brainiac."
"
The force that was Imperiex can not be nullified. It is eternal and has been absorbed by me."
"With the power of Imperiex growing within me, I will make the music that controls the spheres."
All this shows he's not just got the power of Imperiex, but is actively channeling it through Warworld to power up everything about it. Especially see it in the quote
"Maxima's attack on Warworld was quickly disintegrating in the face of her own arrogance and Brainiac's overwhelming, Imperiex-stoked Firepower." as it shows B13 channeling Imperiex's power into his auto defenses, while still maintaining control of the tendrils. This shows even without his full focus, he's amping all of Warworld.
Then, when Superman moves Warworld, we have Brainiac 13 explictly say "
Full Thruster Countermeasures! How is he moving my planet!?" And when he says that, we see that the one of the tendrils is gone
when even a page before, his tendrils were actively a threat. (
The Tendrils, of course, being part of the Imperiex power). The other i
s shown to be retreating from Earth and back to Warworld as well in the following pages. We also see literally the page before he switched to "full thruster countermeasures"
he was amping his other bodies with Imperiex energy to try to stop Superman (we can see them glowing purple with Imperiex energy only for them to disappear when he activated the countermeasures, implying he's focusing the energy on the engines)
Then, Brainiac is reduced to begging Superman to stop, powerless to stop him while Imperiex begs Superman to free him. The implication is Brainiac was using as much power as possible but couldn't stop Superman.
While it's possible that he's not using the full power of Imperiex for the engines, I feel that wouldn't really make sense given what we're shown and told. At minimum, and my main argument, Brainiac 13 was using as much of the Imperiex energy as he could to stop Superman.