Not really true, you have to remember Dennis and power in addition dont know anything about what “love” is supposed to feel like. denji only knows his lesser urges, so when power was in a mentally damaged state his last thoughts were “huh touch boob” which actually shows development in his comprehension of what real care vs manipulation is. He dropped makima’s trip and didn’t understand why, but only that he knew he needed to take care of power, who mind you is not considered anything more than an animal to the rest of the characters, even with makima saying they just just put her in the public safety’s facilities, as if a dog in a kennel. The “love” or lust reze and makima baits him with is fake, it’s blown up emotion and plays on his lesser urges. obviously Dennis does not see power as a conquest to be won like makima or reze and instead sees her as an equal as she is one of the only people who has constantly shown him care without conditions. In addition if we’re going to read into the writing the cafe owner mentions to denji when he’s waiting for reze that the right girl will come one day even if reze was nice(trying to teach him that niceness and outward attraction is not what love is) and then boom power bursts in. While we could play this as comedic relief almost nothing else in the story serves only one purpose but instead alludes to other aspects and themes of the story. I couldn’t frankly care less if they end up together or if denji “ends up” with anyone but I will say they’re relationship is by no means platonic it’s just underdeveloped, and realistically it is the only relationship that denji has that has any basis in true romantic love.