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They are talking about this line:

> Me: sure, can you remind me of the employee discount again?

Which suggests that you would/did ask for (an employee) discount code when renting from that company.

If you use a discount code, say the Boeing discount code when you rent at Seattle Airport, Hertz will cancel any insurance off the price because Boeing covers those risks itself for its employees. But, if you’re not a Boeing employee and you crash, you’re not insured by Boeing and you’re not insured by Hertz.

They are referencing the line about the employee discount.