someone who took another company who’s success was based on a large network of developers and successfully killed that community
You've got your timeline backwards. The massive Red Hat licensing fiasco was this year. Whitehurst was with Red Hat for 14 years before he resigned in 2021, along with a number of senior Red Hat staff.
I took Whitehurst and others' resignations as a bad omen. I remember the conversation around Whitehurst leaving (e.g. /r/redhat, /r/linux), was primarily about IBM taking over and the impending death of Red Hat.
I trust Whitehurst more than most other possible candidates. I don't know if he'll save Unity, especially if what I'm hearing about the board is true. But his track record is way more positive than you're giving him credit for.
Glorious