I met/had a similar experience with Google ATAP in 2013 (was Motorala ATAP then; Google recently bought them) though not for a job interview but to discuss working together to build our tech SpeakerBlast into the Moto X. They asked if we ever thought about selling our technology to them before the meeting and at the meeting they baited us for how our tech worked saying we'd like to work with you tell us how it works.…
Also I didn't know Google had patents for syncing audio across phones. I wonder if any of the mobile apps (like AmpMe [1]) have to pay some license fees.
I once spent an evening researching the different apps that could sync audio across multiple devices [2]. I also wanted to build my own app, so tried to see if it would be possible (only if you have a jailbroken phone.) I just wanted to play the same audio on two pairs of AirPods. I found out that the Samsung Galaxy S9 has a Dual Audio feature, and the iPhone X can theoretically support this with Bluetooth 5.0. And the AmpMe app can sync audio across multiple phones. (I was also really surprised to find out that they're a pretty huge company with 20 full time employees.)
[2] https://www.evernote.com/l/ACo7ItT-pItKkZoYf0YJy0raGhN5255FR...