I did not read anything in that article about a buyout offer. Think you might have misread the translation.
Guess you did not read it very well
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the Ghent studio that worked on the game for two years has choice stress. "They have been here to buy us."
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The two last Divinity episodes were very successful in their genre, but with the sudden success Original Sin pulled the company also interested in the broader video game industry. "They've been here to buy us," said Vincke, not specifying who "they" are. "We have a choice of stress right now. But we do not know what to do. First vacation, then we will think about our what our next step."