good old fat boy Carlos wants us to learn spanish
It is a loan, partially repaid in warrants for class B shares. But only class A shares can vote, and those are owned by the Sulzbergers.
However, the warrants do expire tomorrow, so Slim has probably already exercised them: “The warrants expire on Jan. 15, 2015 — meaning Slim must make his move soon. The company has set aside the shares and is prepared to sell them whenever Slim exercises the warrants.”