There's some good advice in there, but mixed in with lots of not-so-good advice, errors, or overly broad claims:

- "The classic typographic scale ... relies on the notion that these sizes, when used together, look pleasing to the eye."

The typographic scale has a fixed set of sizes because fonts used to be physical. Having a 71pt font would be a whole new box of lead.

- "I generally take the largest font I want to use and the smallest font I want to use, and place the headers into that scale at even measures."

For something like scale, a geometric progression makes more sense so that relative sizes are at even proportion (say each is smaller than the previous by 15%) then a linear progression of sizes. The difference between 72pt and 70pt is unnoticeable. The difference between 10pt and 8pt is huge.

- "One way is to adjust the kerning and tracking settings in your design program."

Another way, not mentioned, is to just choose a different weight.

- The "stroke width should be as even and consistent as possible"

It says Georgia has a more even width than Krungthep, which is visibly not the case. Some stroke variation seems to aid readability but too much (like modern serif faces) harms it.

- "Georgia features a larger x-height than Tekton Pro."

That isn't Tekton. WTF.