Didn't see any specific argument, just a blanket statement.
The second definition applies.
argument
ˈɑːɡjʊm(ə)nt/
noun
noun: argument; plural noun: arguments
- 1.
an exchange of diverging or opposite views, typically a heated or angry one.
- 2.
a reason or set of reasons given in support of an idea, action or theory.
"there is a strong argument for submitting a formal appeal"
synonyms: reasoning, line of reasoning, logic, case; More
defence, justification, vindication, apology, explanation, rationalization;
evidence, reasons, grounds;
argumentation, polemic;
assertion, declaration, claim, plea, contention, expostulation, demonstration
"his arguments for the existence of God"