Right, so what is it about this particular individual that lends credibility?

If an economist was writing about computer science, everybody on HN would dismiss it.

Per her bio:

I have a bachelor’s degree in electrical engineering and a master’s degree in engineering management, with a focus on engineering economics and financial modeling. I oversee the finances and day-to-day operations of an engineering facility.

I’ve been performing investment research for over fifteen years in various public and private capacities.

So it is a mixture of education and practical experience. Whether that lends weight to her output is up to the reader.