No, simple physics say wifi6 has about the same latency than gigabit ethernet (and most people don't have gigabit routers and cables at home), it's like 20% faster than ethernet and has a longer range.
The article you linked doesn't cover wifi6. The article is from 2018 and the first wifi6 devices were Samsung Fold and S10, released in March 2019. They mention that for the comparision graph they did use a wifi5 router.
This one does and says "For example, when you look at the theoretical top speed, Wi-Fi 6 reaches 9.6 Gbps (compared to Wi-Fi 5 which clocks in at 6.9 Gbps). In real world testing, Wi-Fi 6’s single stream speed has been raised to 1.2 Gbps - 20% faster than connecting via Gigabit Ethernet.":
https://www.techradar.com/news/wi-fi-6-vs-ethernet-who-is-taking-the-connectivity-crown
Edit: here's another article where they tested wifi 6 running at 1.5Gbps, so it's 50% improvement instead of 20%
It's still too early for most to buy in, but the numbers we're seeing from these next-gen routers are very promising.
www.cnet.com
This other article mentions when talking about wifi 6 vs wifi 5 "four times as much data deliverable simultaneously to multiple clients and latency cut by 75 percent":
The 802.11ax standard addresses wi-fi challenges such as client density and latency, but it's still early days, with final approval not expected until late 2019.
www.zdnet.com
For the test of your article they're using the Nighthawk X6 router (wifi 5, 802.11ac). If we take the ~5ns and cut it a 75%, then wifi 6 latency should be ~1.25ns, without considering other benefits like sending up to 4x data at the same time compared to wifi 5 and without considering wifi 6 is up to ~50% faster than gigabit lan, or considering that wifi 6 better than wifi 5 shielding against closer wifis from neighbors to reduce interferences. So the new king is wifi 6 and not ethernet (simple physics).
Extra video talking about wifi6 benefits: