Here is an article
"On Rewriting the Bible - Catholic Biblical Studies in the '60s" by Fr. Brian Harrison OS in
Christian Order which discusses the controversy which gave rise to that quote. Msgr. Romeo wrote against the liberal biblical scholars who had already become entrenched in the Pontifical Biblical Institute under Pius XII - the kind of 'scholars' who claim, for instance, that the promises of Christ to St. Peter were invented by the author of St. Matthew's Gospel. Bl. John XXIII had two of these modernist professors sacked after Msgr. Romeo brought this to light, but they were restored by Paul VI.