He didn’t plan on spending 44B. The plan was to manipulatie stock price with pretending to buy, but Twitter management saw that one coming and let him sign a document for 44B that the rich idiot didn’t read.
So when the “I changed my mind” phase of his master plan started, Twitter pulled out the document and forced him to cough up the 44B. So yeah, now he pretends it was the plan all along.
"“engineering details” is usually code for “very expensive”.