The particular advice I gave is less relevant to young people, since they have less savings and tend to have better investment opportunities in terms of paying off student loan and other long-term debt. Paying off student loans is effectively an investment that you can never sell back for ready cash, so you'd need savings in something that's actually somewhat liquid.

More on point, if you don't have access to enough emergency credit, that is the perfect reason to essentially have a self-insurance fund. That fund should cover perhaps a couple thousand dollars - anything more than that and you can typically work out a payment plan or tap your less-liquid investments.