I fetch those from 10-Q forms through an internal scraper I built. The response is quite big, you can check it out here: https://www.quantiq.live/docs
Honestly looks like a scam and your description of it makes it even sound more like one. Most of those fields you return in that docs page have nothing to do with k or qs and are equity pricing data you are buying from another third party.
Not a knock just being honest as it looks like you just don’t know so maybe this helps. Here is an example of a real company that scrapes k/q docs.
Nice! Makes me wonder how many other businesses are possible to build, on top of govt data.