1. There is math for how long it takes to send even one packet over satellite connection (~1600ms). Its a weak argument for the 14kb rule since there is no comparison with a larger website. 10 packets wont necessarily take 16 seconds.
2. There is a mention that images on webpage are included in this 14kb rule. In what case are images inlined to a page’s initial load? If this is a special case and 99.9% of images don’t follow it, it should be mentioned at very least.