Nowhere are the supposed rare books listed. Confuses "(not all that) old books" with "rare books". Ragebait, nothing more.
They are academic titles from the last few decades for the most part, and are rare because the print runs were typically short, and the prices typically eye-watering. “Semantic analysis of cotton processing terminology in Des Moines, 1993-1996, 8th edition”, that sort of fun.
"This is not a novel to be tossed aside lightly. It should be thrown with great force."