First of all, the passage explains that the evidence that the Chevalier borrowed money from a Swiss merchant indicates that he was not wealthy as he told in the memoir. Nonetheless, the speaker refutes this point by contending that he borrowed money from a merchant because he was waiting for money from selling his properties. So, it does not mean that he was poor.
Secondly, the passage asserts that the Chevalier might not have written an accuracy record of conversation between himself and Voltaire because