The latter are also aware of survivorship bias
I think that taking advice from those who failed is as important as from those who might suffer from a "survivorship bias". I am sure most of these failed startups initially followed Musk's (et al.) "impossible is nothing" mantra before venturing out into the market.
While that may be true, it would be interesting to compare the frequencies with which successful founders bring up the topic of survivorship bias vs the rate at which those who never found anything bring it up.