Article explains it:

Shortly after Arison was hired as CEO in October, Twitter users unearthed tweets he’d written expressing support for conservative politicians, many of whom had expressed anti-LGBTQ+ views. Robin was willing to give him the benefit of the doubt after he told staff he would change, but says the recent alleged union busting has broken that trust.

They hired a rightwingers as CEO, and even if he changed his mind on social policy, he's still obviously a Republican on fiscal.

This is a way to get rid of highly paid people since the labor pool for tech ballooned after twitter fired everyone.

He's hoping for a short dip, then replacing everyone for cheaper salaries.

The second part, I think people don't pick up on that often enough. These return to office pushes are soft layoffs. They get to do a layoff without paying severance or even unemployment.

I can only guess they wanted to punish the unionizers or just do a major layoff without calling it a layoff.

Maybe, but this way you have no control on who leave, which probably are the people you would like to keep since they are the most valuable people you have and being good they could find a job that accomodate their WFH request.