[cphajduk]

Actually - It doesn't get the numbers right either. If you look at the first reference, "[1]", the author says:

"I’ll justify this figure in detail later on. For now, consider that each SLS launch costs $4.2B, and that developing just the Orion space capsule has cost $20B. The ISS, which is functionally close to a Mars transfer vehicle, has so far cost $250 billion."

With absolutely no regard for the massive cost per kg to orbit improvement being achieved by new space companies (SpaceX, RocketLab, etc.)

The author has cherry-picked his facts to fit his opinion.