Google offers two versions of this wipe. The whole phone, and only employer data. Wonder if they did the whole phone on accident, malice, or they are trying to say they "wiped" the phone but only removed employer data.
That only works on Android, if you have an iPhone, you always give your phone over to the employer.
Another (to me more plausible) option: The employee was unable/unwilling to separate the personal from work. So the "personal" data included (or could have reasonable suspicion of including) employer data.