Question about Azure alliance and pricing

I read this article which said that there is an alliance bewteen you and some services including azure in terms of pricing. This means, as I understand it, that the outbound traffic from an azure service to this cdn would be billed less by azure. I did a load test using an azure blob storage account and connecting it with a subdomain here in cloudflare but I did not find any evidence that the storage billed me less than expected. It was in fact excatly as expected for normal azure blob storage bandwith usage. So I’m wondering is the information in this article true ? If not, is there an alliance between cloudflare and some other storage service perhaps? If yes, how do I activate this bandwith pricing discount ?