The math doesn't actually math. Even if you're not discounting the cash on hand from GME's value all of GME's market value, plus their cash on hand, plus the "highly confident" $20B still doesn't add up to the take over value in Cohen's letter.
What a bizarre interview that was. The least damaging interpretation is he was intentionally being bad to spite CNBC in a basically (though their explanation doesn't include this) childish fit for earlier bad coverage of GME.