Connecting Orbi RBR 50 to Orbi RBS 50 satellites

Long story short.

My existing network is an Orbi RBR50 router wifi connected to three RBS50 satellites. My home has ethernet access points in various rooms not currently connected. I'm talking to two network specialists about connecting them, and have two different opinions about using my existing Orbi products.

One says when the ethernet network is wired, and we connect a satellite to that, it will be hardwired to the network as opposed to wifi connected. When it is, any devices we then hard wire to the satellite will be as if we hard wired it to the router itself. The other says the RBS50's are only boosters since there is no "in" jack, only "out" jacks, and will remain wifi connected.

Any idea which is correct?

This is important in that I want to hard wire connect as many devices as possible, and assumed I could do that using the satellite ports. But if an ethernet connection does not result in those ports being hard wired, I need to take a different approach. The other issue is cost. Using my Orbi products will save $1k or more of what the contractor who believes the satellites will remain wifi connected would charge to install new equipment.

Apologies if any of this is not clear.