So the other day, on the official VOMS channel, they held an hour-long livestream. The first few minutes talked about Pikamee's decision to graduate.
第一弾告知:https://www.youtube.com/watch?v=Cm-v-gmjl1M第二弾告知:https://www.youtube.com/watch?v=OV1KC8HlWL4#VOMS_PARKVOMS Project 3rd Anniversary POP UP SHOP『VOMS PAR...
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It's entirely in Japanese but some of the live chat viewers were translating during it. Around the 6 minute mark, VOMS founder GYARI says that they had been discussing Pikamee's decision to graduate for a "very long time".
In other words, there is evidence to suggest that she was going to graduate anyway regardless of the Hogwarts Legacy shit. Does this mean that had no influence over her decision? I have no idea. The thing about these kinds of announcements is that they're always pretty light on the details and that's just standard Japanese corpo language.
It could've already been planned or it could've been something she was considering and then during that month-long silence after her Hogwarts announcement she made her final decision. We'll probably never know for sure. It still doesn't validate any of the harassment she got from from Twitter's dedicated dilators.