The listing agent for this property is a woman who has been a REALTOR for several years. I don't know who you reached; but you referenced the person that you spoke with is a man. You did not reach the listing agent.
If you are interested in seeing the property, you can arrange a showing - without any advance deposit, through any number of agents. It is not a requirement in order to see this property. If you have an interest in this property, by all means, pursue the appointment because the 'deposit' issue was related to the individual you spoke with, not this property.
I have heard of buyer agents charging an upfront deposit, and crediting that back at the closing, but the practice is rare.