Nonsense. I like to collect old textbooks. It provides a useful way of exploring the development of ideas (and insight into changes in teaching methods.) Consider Biology by Claude Villee, 6th edition, 1972 W.B.Saunders Co. ISBN:0-7216-9022-X, Chapter 34, p756, The Evidence for Evolution. The very first item, Evidence from Taxonomy, includes these remarks:
"Present day taxonomists are concerned with describing species primarily as a means of discovering or clarifying evolutionary relationships. The fact that the characteristics of living things are such that they can be fitted into a hierarchical scheme of categories - species, genera, families, orders, classes and phyla - can best be interpreted as indicating evolutionary relationship."