The problem with HOWEVER

The below is from Webster's Learner's dictionary on "however."

1 -used when you are saying something that is different from or contrasts with a previous statement
? I'd like to go; however, I'd better not.

And the below is from the book, "The structure of scientific revolutions."

[page 1] That image has previously been drawn, even by scientists themselves, mainly from the study of finished scientific achievements as these are recorded in the classics and, more recently, in the textbooks from which each new scientific generations learns to practice its trade. Inevitably, however, the aim of such books is persuasive and pedagogic; a concept of science drawn from them is no more likely to fit the enterprise that produced them than an image of a national culture drawn from a tourist brochure or a language text.

In the dictionary, "however" contrasts with a previous statement, but the latter example shows otherwise. It seems that however contrasts not with the previous statement but the following.

I mean, "the aim of such books is persuasive and pedagogic" contrasts with "a concept of science drawn from them is no more likely to fit the enterprise."

Am I right?
Thanks in advance.