Internet 'marketing' is a fascinating pyramid scheme, where established players create content to help new entrants create content that will expose them to newer entrants. Somehow this should get everybody paid (not just the big players selling the domains and website creation tools).
A minuscule number of new entrants have achieved some form of success, so of course they get a louder and more influential voice.
I think you're confusing internet marketing with the people who talk about internet marketing.
Marketing done right is basically the 'what people want' in 'build things people want' with a focus on what they're actually willing to pay for. I routinely kill ideas because the market is too small or profitability is too hard to achieve. Understanding your audience then building content and product around it is harder and more valuable than HN seems to believe. I've been very successful by developing this skill and learning how to build things. Good marketers have domain and industry specific knowledge that doesn't go viral in marketing circles because it's too specialized. I'm also not about to get on a public forum and tell my competition how I'm beating them.
Internet marketers who idolize internet marketing speakers are insufferable, I'll give you that. It comes from a good place of wanting to learn by listening to the experts. Unfortunately, these experts spend more time talking about how to be like them rather than how to build something people want. I think this also comes from a good place: let me help you achieve success like I have found.
Meanwhile the more technical marketers roll their eyes, get to work, and quietly make their companies money.
A minuscule number of new entrants have achieved some form of success, so of course they get a louder and more influential voice.