Question about Linksys Velop WiFi 6 AX4200 Mesh-WLAN Tri-Band-System pack of 2 (MX8400)

Yes, this is actually a tri-band system. It has three separate radio bands: a 2.4 GHz band with 574 Mbps and two 5 GHz bands with 1,201 Mbps and 2,402 Mbps transmission rates. The third band is therefore a second 5 GHz band that is used for additional capacity and better mesh backhaul connections.