They have some information about the frequencies stuffed at the bottom of their FAQs. One omission that bugs me is that they don't tell you the location of the ground stations, which can be a dealbreaker for whether or not this is effective

It's leveraging Lockheed technology [1].

[1] https://www.lockheedmartin.com/en-us/products/verge.html

Per the Details page:

"You can connect with any satellite in low Earth orbit (LEO) and medium Earth orbit (MEO) operating in X-band and S-band frequencies, including: S-band uplink and downlink, X-band narrowband and wideband downlink."

I don't think AWS are involved in the satellites themselves, they are simply making access to ground station equipment available over the net.