It is Avery's go-to insult and an attack on F.J.A. Hort, an Anglican prelate and translator of the Bible who, unlike Avery, was fluent in Koine Greek, could read and write Hebrew AND Latin.
We have no access to the Urtext, solely the translations / later editions such as the LXX or the Masoretic. As such comments on the inspiration of the urtext are surely unimportant?