They likely mean that the submitter, avetiszakharyan, should disclose their relationship to Localforge.

Fascinating.. I wonder how much of the economy runs on social proof

It's not uncommon on HN! We frequently have people chiming in as CEOs, insiders, and experts in various fields without much proof. Generally, it hasn't been a problem. Or at least I've not seen any examples of having wool pulled over our eyes in this fashion.

Sure, if you already know what Localforge is before clicking.

I didn't know, and still assumed the blog post on localforge.dev was written by the localforge.dev people. Who else?

Where do i put that, in the blogpost or?

If you can still edit it, adding it to your first comment is fine I would say. "Disclosure: I am the author of Localforge" or similar.

No thats the only thing I can't edit tbh :(