Thanks Ben.
collātĭo (conl- ), ōnis, f. confero,
I.a bringing together, collecting.
I. Prop., of the standards in war for battle, a hostile meeting: “signorum,” Cic. de Or. 1, 48, 210: centuriarum, for voting, id. ap. Ascon. in Toga Cand. p. 85, 18 Baiter: “hyacinthorum et auri,” Plin. 37, 9, 42, § 126.—Of money, a contribution, collection, a gratuity collected together for the emperor: “stipis aut decimae,” Liv. 5, 25, 5; 4, 60, 6; 6, 14, 12; Tac. G. 29; Suet. Calig. 42; id. Ner. 38; 44; id. Tit. 7; cf. Plin. Pan. 41, 1 Schwarz.—In jurid. Lat.: “collatio bonorum,” the putting together of the possessions of several, in order to divide them equally, Dig. 37, 6, 1, § 8; cf. Cod. 6, 20: de collationibus, et saep.—
II. Trop.
A. Malitiarum, a union, combination, Plaut. Mil. 3, 3, 67: “vocum,” Dig. 47, 10, 15, § 4.—
B. A comparison, similitude, παραβολή: “collatio est oratio rem cum re ex similitudine conferens,” Cic. Inv. 1, 30, 49; id. Fin. 2, 27, 75; id. N. D. 3, 28, 70; id. Div. 2, 17, 38; id. Tusc. 4, 38, 84 (cf. Quint. 5, 11, 23; Hirt. B. G. 8, 8; Quint. 8, 3, 77; 7, 7, 2; Plin. 37, 9, 42, § 126).—
C. In philos.: “collatio rationis,” the analogy, Cic. Fin. 3, 10, 33 Madv.; id. Tusc. 4, 12, 27; cf.: “rerum saepe factarum inter se collatio,” Sen. Ep. 120, 3.—
D. In gram.: collatio secunda, the comparative: “collatio tertia,” the superlative, Fest. p. 181, 28, and 286, 26 Müll.—
E. The comparison, collation of texts, manuscripts, etc. (late Lat.): aliquem multorum codicum vetustiorum collatione confutare. Aug. c. Faust. 32, 16.
Not so sure it definitively means that the gospel was written. But why else does the author object to the statement made in the Preaching of Paul?