This is my theory about the Sayuki Scandal and how H!P handled it:
Apparently H!P knew of the relationship of Sayuki and the singer from when it started back in 2019. I have said it before; I believe H!P has a new rule instead of the 'no boyfriend rule', it is the 'don't get caught rule'.
This also shows with previous similar scandals with younger members who were suspended or just remained their activities.
I believe Sayuki has been thinking about graduation in the upcoming year already and that's why they announced the Auditions before.
Wotas seem to be 'okay' with the affair and considering how they handled previous boyfriend scandals I don't think they forced her to leave.
But if Sayuki would have stayed now and would announce her graduation in a few months, wotas could be disappointed like: 'We agreed to her staying and now she is abusing our trust by leaving anyways.'
So my guess is, this has just sped up her leaving by loosing a graduation period.