The Dante virtual sound card (host) will add a minimum of 4ms overhead, with minimum ASIO latency of 1ms. It is software, and I would expect that it is more for driving PAs than for serious recording work.
The Dante interface card (client) for Yamaha devices can be set for latencies of 0.15, 0.5, 1.0, or 5.0 ms.
The physical Dante sound card (host) cites network latency as low as 150us, and round-trip latency, including audio app, as low as 2.99ms, which is about what I currently get with my Cubase and Firefaces at 256 samples at 192k/32.
Hence, it appears that using the software Dante host is the limitation in your friend’s setup.
For serious recording, I would expect to use a physical Dante PCIe card to get the lowest latencies. Unfortunately, the Focusrite one is $1000. Hopefully if Audinate can get better traction for Dante by providing a client ASIO wrapper, the price will drop.