One thing I find interesting about Pantheon season 2 is the difference between Holstrom and Caspian. Now there are a lot of differences between them, but I’m talking about the the big one. The one that made it so that Caspian could cure the flaw, but Holstrom couldn’t. I’m talking about how each of them feel love. 
Now, throughout the entire second season it’s all, but explicitly stated that Holstrom couldn’t understand love and that’s why he could’ve never fixed the flaw.
It’s a good way to highlight how the two genetically identical men differ, why one is our secondary protagonist while the other is the main antagonist. It also shows the audience Caspians understanding of love though his growing relationship with Maddie throughout the season.
But some viewers may be confused by this difference. After all doesn’t Holstrom have a love interest in Renee?
In fact don’t they spent a large amount of time collaborating on Holstrom’s plan, with her essentially being his arm in the physical world? Does their love not count just because they’re evil?
Well no. At least that’s not the reason their “love” doesn’t count. But to explain why we need to talk about how the show conceives of love.
In Pantheon love isn’t just about people liking each a lot. Not even to the point of where they’re willing to do a lot for their partners. Love is when people push each other along with supporting them.
Real love, to Pantheon, is challenging each other to be better and making each other better. It’s give each other perspective that they couldn’t have on their own. Love is something active between the people sharing it, it can’t be mindless adoration.
We see this healthier love with several of the couples throughout the show. David and Ellen start with several fundamental disagreements over the UI situation, to the point where it drives them apart at first. But when they reconcile you can tell how much they love each other even if they never officially get back together. Then you have Olivia and Farhad, who the show spends an entire episode displaying how they challenge and complete each other.
And of course, we have Maddie and Caspian.
You could make a whole separate post about how their viewpoints change and clash throughout the series while strengthening their relationship. But suffice it to say that the show views their love as the truest it could be.
And taking all this into consideration it should be obvious by now why the show considers Stephen and Renee’s relationship not to be an example of love. Renee doesn’t contribute intellectually to any part of it, she is ok simply fauning over the eccentric genius. While Stephen is content with basically being a relationship with a yes woman who goes along with everything he says and does.
And the most insidious part of their relationship in my opinion also relates to why Renne was chosen to play the part of Caspian’s mother.
We see in the interviews with Holstrom about his past that he never really cared intellectually about anything his mother said. He saw her as someone to care for, and thus receive care in return. Some may call this unconditional love, but Pantheon considers it an unhealthy love.
And as you probably noticed, the way Holstrom described his relationship with his mother sounded awfully similar to his relationship with a certain someone.
Which makes their already messed up dynamic even creepier. Especially when you consider how they wanted to shape Caspian.
TLDR: Holstrom couldn’t cure the flaw not because he couldn’t convince of love, but because his very conception of love was itself flawed.