to get back on topic.
I believe the above requirement excludes anything that had been cut on a Neumann cutting lathe without the MT-75 or similar console since the preview to set the groove pitch is analog but then the signal is digitally delayed and then fed to the cutterhead. The MT75 has a preview head equipped Telefunken M15A does this delay in the analog domain by using dual heads (preview/cut) spaced the appropriate distance apart for the required tape speed. The Ortofon-Lyrec combo in the video below also keeps it all in the analog domain by the same method.
That is a little bit misleading/misinforming. I’ll skip commenting on ERC.
Besides Telefunken, companies like Studer, Ampex and MCI all offered tape machines with preview head. There are also other brands like Scully that offered tape machines with preview head but they’re not widely used. All of those tape machines that have preview head are adjusted for required delay for appropriate lathe/lathes.
A preview head is located physically before the actual head and feds the computer for upcoming signal. The actual head feds the cutterhead. This all happens in analog and no digital is involved. If you have a tape machine with a preview head then there is no need for a digital delay cause you already have it physically.
For the time being famous mastering facilities that are using Neumann VMS 70 lathe and SX-74 cutterhead either own a Studer A80, MCI JH-110 or other tape machine with a preview head. Preview head helps the analogue computer in lathe at determining pitch and depth of the groove for maximizing useable area on the fly.
KG uses VMS 70 lathe and Studer A80 tape. They both have 0.6 delay so no problem on cutting all analog.
Neumann’s later model the VMS 80 requires 0.5 delay and both Studer and MCI have adopted to new specification when VMS 80 released and offered modified versions. Sterling uses a modified ATR 102 tape machine with an added preview head for VMS 80 lathe at 0.5 delay so they can cut all analog.
TML used to own Scully and Neumann lathes together with MCI tape machine with preview head AFAIK.
BG uses Scully lathes with Neumann SX-74 cutterhead (I believe he also has Westrex 3D). Scully lathes require 1.0 delay but lathes at BG are highly modified and can be used with Studer A80 instead of Scully 280 or Ampex 300 tape machines. Again all analog
You’re right about the existence of digital delay.
It was used back in the day by some mastering engineers which don’t have tape machines with preview head or arranged for different delay. Another limitation is not obtaining the master tapes. Digital delay is used only after the arrival of digital era and I’m sure it’s still in use by some engineers but not by any of the respectable mastering facilities.