grandmaster
Veteran
Sure, but that doesn't mean they're very exclusive either to the point of refusing to even think about indie devs. As long as you are a professional outfit, even if just a one-man band, you should be able to fill in that form and get Sony's attention as any other developer. The form is just there to stop wannabes inundating Sony with garbage, I think, rather than limiting development to established mainstream studios. If you're serious, create a prototype, get yourself a 'company website' and apply. If Sony aren't that open than their policy is contrary to their PR comments about being open to anyone to approach them.
Having gone through this route myself, it's far from easy, but you're bang on with the bolded part of the statement. I'd also say that it's going to be next to impossible for an individual to do this - you're going to need to be part of a company. You're also going to need to sign your life away with a Sony NDA. I don't think it's at all feasible for a hobbyist coder to be honest.