Ok, I removed the Author name before I commented on this.
The only typo I see is the use of the words "Implied Datum - a common error" as the datum's are NOT implied.
The basic dimensioning method shown in figure 5-105 would be preferred however the dimensioning method shown in Figure 5-106 still gets the job done.
Figure 5-106 would require the quality inspector as well as the machinist using manual setup methods to perform some math to get usable basic dimensions where the Figure 5-105 method is more direct for manufacturing and quality. Rotating the part using a sine-plate is academic and requires little mathematics for manufacturing and quality.
When using a programmed CNC and CMM the dimensioning methods become less critical.
IMHO, dimensioning and tolerancing should be presented so that manufacturing and quality do not need advanced math skills to get the job done. All engineering drawing creators should work hard to ensure that the engineering drawing is complete, accurate, and focuses on function and manufacture-ability and is easy to read.