> along with more decoupling caps to filter the input and output of the LDO That's what the article is talking about - the output capacitors in their cheap pow

> along with more decoupling caps to filter the input and output of the LDO That's what the article is talking about - the output capacitors in their cheap power supply weren't big enough for the peaky load of the router. (Well, probably were assuming a sinusoidal input, but not big enough when the stairstep input has big gaps).