I would say, yes -- "do not, or heavily discount, all successful people's advice" -- is advice that is life +EV.
Most successful people are not statisticians, nor drawing their conclusion from a sample larger than, say, themselves and perhaps the few successful friends closest to them, when giving the sort of advice in the OP. Moreover, given how easily humans tend to conflate "What did successful people do?" with "What did successful people compared to the set of people who tried to be successful?", the risk of bad advice is even larger. At best, you're hearing white noise, but more than likely, you're hearing a case of survivorship bias (even worse than white noise).
Most successful people are not statisticians, nor drawing their conclusion from a sample larger than, say, themselves and perhaps the few successful friends closest to them, when giving the sort of advice in the OP. Moreover, given how easily humans tend to conflate "What did successful people do?" with "What did successful people compared to the set of people who tried to be successful?", the risk of bad advice is even larger. At best, you're hearing white noise, but more than likely, you're hearing a case of survivorship bias (even worse than white noise).