They have used the takeover/buyout term interchangeably throughout the PR's. For example, this is the title of the FIRST PR about the deal:
Global Diamond Exchange Inc. Management Considers Potential Takeover or Merger
They also use merger/buyout in that same PR. It's definitely an inconsistency. Takeover could mean buyout to some people, but I think they are two different things. Takeover to me means to gain a controlling share of the company and a buyout is just that, all shares. JMHO