On the Fake Suicide page, it says that YandereDev is unsure of whether or not you'll be able to get Kokona on the rooftop because of her phone call. I don't see why not, honestly. Why wouldn't YandereDev want to add that in? Maybe is it because of an in-game reason, like what if Kokona doesn't think she could get in trouble about being abused by her dad so that she'll be more willing to talk about that rather than talking about something that she did herself and had control over? Like, Kokona knows it's not her fault that she's being abused by her dad. However, Kokona knows that she did something wrong with the guy on the phone and is feeling more guilty about that.
I was thinking that maybe it was hard to program, but YandereDev is an extremely hardworker and wouldn't let one of his games have a small plot hole in it just because he couldn't program it. I'm sure he'd find a way. I'm just still curious.
Really, all he'd have to do is add another wording option. Rather than "I'd like to speak to you", it could be "Come to the _____, I will tell the school all about your secrets about ______." or something in that manner. Or, he could just add that option to the list of things Yandere-Chan would "Like to talk to her about", ya know?