It's from the bibliography section. Since the book cites the Sheiltot (Dyrenfurth 1786) it also mentions the haskamot in this, the second printed edition. Noting that one of the approbations is from Rabbi Ezekiel Landau and the Prague Bet Din, we are treated to an approximately 600 word essay on the etymology of "Zanvil," the secondary name of the one of the members of the Bet Din. Lowe even brings Syriac into the discussion!
(The Noda Beyehuda's haskamah is very nice; he expresses the strong desire which people had to see the Sheiltot, which was not known firsthand by most scholars, as it had only been printed one time, 200 years earlier. He says that you can't even find one copy in a city.)