As I understand it the team didn't premine this themselves, someone found the discord and leaked it whilst the team was not ready to go public yet, the newcomers then started mining right away and bomb nicehashing it so the team had to do premature announcements relative to what they planned in the first place.
There's really no way to know that at the moment though. It might as well be the devs that mined initially.
It's pretty obvious at least that they wanted mining to start before the ANN here was published as they had:
1. PUBLIC GitHub
2. Was tweeting about the project
3. Their site was up
4. Medium posts published
All before they planned and published the ANN.
You can only speculate on what the motive been this is.
So the rules for new project is not to communicate unless they've made a ANN on bitcointalk or it'll be shunned by miners? Where is this rule written?