Meh, if their advice is useful to an 'indie hacker', then why not have it?
There are all kinds of people who give "useful advice" that could, in theory, help an indie hacker, but are actually aimed at a general audience. In the extreme case, consider diet and beauty tips, relationship advice or stock investing strategies. Yes, those things are useful to many if not most indie hackers but they're also easily found on more general sites and can easily crowd out more focused content.
It's because, for me personally, the thing that makes IH special is the stories of people who didn't have degrees from elite schools, family wealth or VC funding and still successfully built something sufficient to cover their living expenses or even start hiring employees. Stories about people who do a lot with a little are a blueprint that can be applied by people of just about any background. Stories of parlaying medium-sized fortunes into large ones are most useful to people who already have medium-sized fortunes.
To be clear, I don't dislike interviews with founders of large companies. I sometimes watch them on youtube and have read books about many of the largest tech companies. It's just more useful for me to learn about how people went from 0 to 60 rather than from 60 to 200.
IH is still my favorite place on the internet for that, which is why I care about how well it serves that role. You'd have to dilute it quite a bit before it fell behind the next best alternative, though.