Last week, the activist investor proposed in a letter to shareholders that Dell undertake a tender offer for 1.1 billion shares at $14 each as an alternative to Michael Dell and Silver Lake Partners' proposal to take the computer maker private.
"To me the company seems desperate because they keep obfuscating the facts," he told CNBC.
"They now say the $5.2 billion we are raising will not be enough to pay a tender offer of $14/share. The reason they give is that we will need the money to pay back the Dell debt that's coming due. However the debt doesn't come due for a year and a half."
Icahn was responding to the company's special committee saying his proposal was "lacking credibility and inconsistent."
(Read More: Carl Icahn Could Drop Out of Dell Deal)
"What I learned in Finance 101 is that bonds have an expiration date for a purpose. You don't have to pay them back until the expiration date is reached," he said.
"Additionally, when the tender offer is over, the company will have $5 (billion) in cash and will earn operating income of $3 billion, according to Dell's own consultant, BCG."
— By CNBC's Scott Wapner. Follow him on Twitter @ScottWapnerCNBC.