@Nick I read the article at the link. I did not run the speed test.
There are a couple of things to note :-
Internet speed and wifi speed are not the same.
Internet speed: The speed at which the ISP (Internet Service Provider) delivers internet to one's property.
Wifi: A means for devices to connect to this internet "over the air" (via a router device). It can best be visualized as a kind of "radio" signal. This speed is variable, based on a number of factors :-
1. The type of device - newer devices have the wifi connectors built in e.g. smart phones, tablets. Older computers may not have built-in wifi connectivity, and so you need to plug a wifi adapter device into the USB port which allows one to connect to the router. Different devices connect at different speeds.
2. The type of router - different routers broadcast the signal at different strengths. There is wide variability in how routers broadcast the signal. One can have blastingly fast internet coming from the ISP and a bad router, which isn't capable of producing a signal strong enough to reach everywhere in a house.
That means that every single device one owns can produce a different wifi connection speed, depending on its internal capability, the capability of the router, and the location in the home.
I have done exhaustive testing of different devices in my home, in different parts of the house. I have a mesh wifi system. The incoming service from my ISP averages around 136 - 140 Mbps.
The connectivity via wifi to my mesh router varies between roughly 60 Mbps with an older tablet, from a fair distance away, (on the satellite device), and about 138 Mbps on my cell phone, 6 feet from the main router.
My very old laptop gets about 18 Mbps using its internal wifi adapter, 6 feet from the main router, so I generally use a plug-in wifi adapter for a better signal.
The moral of the story here is that wifi speed is basically subjective - every device/router/location combination will give a different result.
So a speed test which populates the wifi speed automatically is almost always going to be an inaccurate representation.
I take the slowest reasonable speed I can get with my oldest tablet in my Airbnb space to manually enter the wifi speed (60 Mbps) knowing that, for most people, it will be better than that.
You can test this for yourself using the Ookla speed test at https://www.speedtest.net/