Apparently they're not giving them away — it's a loan.
Literal
Give [copula-ではなく], loan [hearsay-だそうです].
くれるのではなく 'not that they give it' — ではなく negates the first option. 貸与 'loan, lending' — a formal Sino-Japanese word for institutional lending. だそうです 'apparently, I heard' — hearsay. The sentence corrects a misunderstanding about whether something is free or loaned.