Because "secured" is a term of art in SEC land, implying various conditions have been met (like a signed contract). Elon was likely unaware of those technicalities when he posted, using "secured" as an ordinary English word.
In any case, he could have easily gotten the money from several different sources, so there wasn't any intent to deceive anybody.
I didn’t argue that Elon tried to deceive anyone.
I argued that it was not true to call it “secured”, and that is a pattern of risk taking by him, which has a mix of consequences, some of which are negative and some are positive.
What would an ordinary person think if the CEO of a company puts into writing that funding to take their company private is “secured”?
It doesn’t mean “I can make some phone calls and put things other”,
It means “a formal agreement is in place for funding.”
Elon thought his handshake deal with the Saudis was good, then they pulled out, because it wasn’t secured.