he was ordered to take part in a virtual training period called a "Corrective Action Program." This is the sort of name given to processes uses when an employee is already performing below expectations. (Where I work it’s a more euphemistic Performance Improvement). If that’s the case here then his firing was a bit less sudden than it appears. Though the entire monitoring process seems draconian regardless.
PIPs are a tool for managing out employees that don’t perform well or don’t yield to often abusive company demands like e.g. overtime or pissed of somebody in management or connected to management.
Last time I got put on a PIP was for refusing an entirely unreasonable request to be on call, and leaving my work phone at home during that period.
I started making plans to resign pretty soon after being put on the PIP.