It’s using LE Audio, which is a new tech explicitly designed for this. Syncing audio should not be an issue, at least once it has some time to mature and client devices improve support https://www.bluetooth.com/blog/10-frequently-asked-questions-on-le-isochronous-channels/
There are tax efficiencies for them being here, but they actually have a sizeable staff presence too. Of all the tech companies in Dublin, they’re the ones I’d most like the opportunity to work with.