Because people are saying provably false statements about it, such as that choi "literally wrote the laws". Maybe there was some wording in there, but it still had to pass the entire national assembly legislative process. There's a grain of truth in there but the conspiracy-level BS is through the roof. I would say this is at 9/11 truther levels of accuracy about now, which is why I'm taking some of the more extreme claims with a grain of salt.
EDIT: I had to google Megalia. That's some sort of SK feminist thing? I'm not sure exactly which parts of what I wrote have any specific connection to that. I'd call out dumb irrational hype about leaders of either gender. e.g. I've called out dumb Trump claims before, when they weren't accurate. Honestly it didn't occur to me that gender was even relevant in this story. I don't normally think of politician's gender as having much relevance to feminism. Look at Thatcher. Sarah Palin. Michelle Bachman. ETC ETC.
Also, Korea is known as an extremely partiarchal society. So there are some rumors flying around that seek to discredit and crush female politicians, about how they're all evil witches who are plotting in cahoots to destroy society? Yeah right, I'm not going to automatically assume those rumors reflect reality in the slightest. Googling "Megalia" that's some sort of grass roots radfem thing in SK. Just because Park is a woman, it seems kind weird to try and link her to some recent radfem movement, purely on the basis of her gender. That's like saying Obama must be an MRA. After all, he's a dude, right?