claiming 2.5gbps LAN but ethernet speed only show 1000Mb/s? Ubuntu 20.04, MSI motherboard

I am having a MSI Z590 PRO WIFI motherboard which claims to have 2.5Gbps LAN. However, when I connect to ethernet cable (cat8). I only have 1000Mbs. Has anyone seen this mismatch before? Any help is appreciated!

Here is some input/output

Type in

lspci -knn | grep Eth -A3

got

02:00.0 Ethernet controller [0200]: Intel Corporation Device [8086:15f3] (rev 03)
    Subsystem: Micro-Star International Co., Ltd. [MSI] Device [1462:7d09]
    Kernel driver in use: igc
    Kernel modules: igc

Type in

ethtool enp2s0

got

Settings for enp2s0:
    Supported ports: [ ]
    Supported link modes:   10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Full 
                            2500baseT/Full 
    Supported pause frame use: No
    Supports auto-negotiation: Yes
    Supported FEC modes: Not reported
    Advertised link modes:  10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Full 
                            2500baseT/Full 
    Advertised pause frame use: Symmetric
    Advertised auto-negotiation: Yes
    Advertised FEC modes: Not reported
    Speed: 1000Mb/s
    Duplex: Full
    Port: Twisted Pair
    PHYAD: 0
    Transceiver: internal
    Auto-negotiation: on
    MDI-X: off (auto)
Cannot get wake-on-lan settings: Operation not permitted
    Current message level: 0x00000007 (7)
                   drv probe link
    Link detected: yes

Type in

sudo lshw -C network 

got

  *-network                 
       description: Ethernet interface
       product: Intel Corporation
       vendor: Intel Corporation
       physical id: 0
       bus info: pci@0000:02:00.0
       logical name: enp2s0
       version: 03
       size: 1Gbit/s
       capacity: 1Gbit/s
       width: 32 bits
       clock: 33MHz
       capabilities: pm msi msix pciexpress bus_master cap_list ethernet physical 10bt 10bt-fd 100bt 100bt-fd 1000bt-fd autonegotiation
       configuration: autonegotiation=on broadcast=yes driver=igc driverversion=5.10.0-1023-oem duplex=full latency=0 link=yes multicast=yes port=twisted pair speed=1Gbit/s