Yep, one or two figures incorrect, but it illustrates the point, and it does say
Footnote 6 also incorrectly suggests that the redshift caused due to the expansion of space is a doppler effect, which is quite wrong. Doppler is a described under Special Relativity, cosmological expansion under General Relativity.
I'm also confused about the authors interpretation of how light from superluminal objects still reaches us
. It's either doesnt not understood or greatly oversimplified.
Cheers,
Andy.