It's funny because if you follow the link to the Reddit post, there isn't a single mention of price guessing so the guy who wrote the NFS article just made up a number.
Signed up just to clarify some errors in this article about being in the "20MHz Band"...
This device operates in the unlicensed 5GHz band and the change made here is to use 20MHz wide channels instead of 40MHz wide channels.
Basically by using skinnier channels you have the ability to operate more devices in the limited spectrum. There's only so much of the 5GHz 'band' dedicated to unlicensed devices so you have to spread your devices out over different sections of the band. If each device takes up less space on that band, then you have room for more devices.
There is not a '20MHz antenna' as you wrote.
Signed up just to comment about how wrong the article is... The RF system is not operating at 20 mHz but is just using 20 mHz wide channels instead of 40 mHz wide channels which means they're making more space in the spectrum (2.4 gHz range) to have more devices without overlapping channels.
Say you have 100 mHz of usable space in the unlicensed frequency band and put 2x 40 mHz channels in, you've now filled that 'band'. If you have 100 mHz of usable space and use 20 mHz channels you can have 4x devices (I'm pretty sure you have to leave some space in between channels).