The article is a few years old but much of it remains true. Intel is the premium 2.5Gbe Ethernet option, has higher performance and lower latency.
Also, google searches quickly show that there are far more people having issues with Realtek 2.5GbE vs Intel 2.5GbE, infact we have one user with an issue with it in this exact thread.
Even Gigabyte agree, which is why they don't install Realtek junk on their high end motherboards, offering both a 10GbE Marvell option (for those with a nice 10GbE home switch) and Intel 2.5GbE chip.
Z690 Aorous Master:
- Marvell® AQtion AQC113C 10GbE LAN chip
(10 Gbps/5 Gbps/2.5 Gbps/1 Gbps/100 Mbps) (LAN1)
- Intel® 2.5GbE LAN chip (2.5 Gbps/1 Gbps/100 Mbps) (LAN2)
Why do you think they opted for the Intel 2.5Gbe NIC instead of the Realtek 2.5Gbe?