I don't know much approximately keyboards, however i am interested by complete 6KRO and NKRO and i heard approximately "capacitive keyboards". I've a few questions that I attempted to look up but I couldn't discover the solution so i'm able to ask right here.
If you are talking about EC [electro-capacitative] keyboards, they are fairly commonly-available. [*When compared with obscure, out-of-production keyboards.]
Topre is the fancy one. Only made by a company HQed in Japan. You can buy the branded 'Japanese' Topre boards, or try ones made by a solid partner like Leopold.
A more accessible point of entry are Niz keyboards. They are a Topre-like keyboard made in China. They aren't built to as high a spec, and are cheaper. There used to be the ABKO Niz boards, which seemed built better.
Any Niz or Topre board should be suitable for gaming, as they will have multi-key rollover.*
I don't know much about the "KB-801N." It seems to be a scissor-switch or rubber-dome keyboard with multi-key rollover. It may be suitable for your needs, but I don't think it's EC.
If you want laptops with NKRO, you can buy one with an integrated mechanical gaming keyboard. These are often Cherry-style keyboards, not EC. But they will be suitable for gaming.
If you search on Reddit under MechMarket, you can probably find used Topre and Niz keyboards for sale. Some of them are very gently used, and good deals. Something like a used Leopold FC660C or similar would be great, if undamaged. You can also buy Niz or BKE domes from certain retailers in small packages, which will give you an indication of what those keyboards feel like.
People who tour with laptops often purchase Leopold FC660C.
*EC boards often have 6KRO. Keyboards based on MX switch designs can be found with NKRO.