Toy company Zuru to subpoena Glassdoor to identify employees that made anonymous online complaints

According to this article the multi millionaire owners of a NZ toy company headquartered in China are trying to identify former employees who anonymously complained about their work experience on Glassdoor in order to sue them. Thoughts? https://www.stuff.co.nz/national/300520880/kiwi-toy-giant-zuru-wants-to-identify-and-sue-former-workers