You left off this gem from one paragraph above what you posted:
29 After much of the mathematics and genealogies, really, of what benefit is this information to us today? Is it not all dead history, as uninteresting and profitless as walking through a cemetery copying old dates off tombstones? After all, why should we be any more interested in the date of Adam's creation than in the birth of King Tut? Well, for one thing, if 4,026 is added to 1,968 (allowing for the lack of a zero year between C.E. and B.C.E.) one gets a total of 5,993 years, come this autumn, since Adam's creation. That means, in the fall of the year 1975, a little over seven years from now (and not in 1997 as would be the case if Ussher's figures were correct), it will be 6,000 years since the creation of Adam, the father of all mankind!
What unbridled arrogance!