Re: Linux kernel doesn't support Realtek RTL8812AU
I think you missed this bit of the article.
That still doesn't make sense to me. Either you're running Kali on a "modem" like those listed (in which case, you can use the wireless hardware), or you're communicating with these things as external devices (in which case, kernel support for the chipset is irrelevant; you talk to them over the standard 802.x network protocols).
Either way, this part of the article is very poorly worded.