There does seem to be one part of their announcement that's a bit off: While similar to other open source unix-like operating systems, it’s unique in that the development of both its kernel and user space utilities are managed by the same core team, ensuring consistent development standards across the project. Wouldn't it be Linux that would be unique in that they don't do this? Solaris, AIX, HP-UX, all the BSDs, Mac…
None of the OS's you listed are open source.
The second part of the statement, the way I read it, is comparing FreeBSD to DigitalOcean's current offerings - Linux. Keep in mind the post is for someone that's already using DO's services, which is a person who has only ever used Linux on their platform.