I would expect them to contact the manufacturer. But that doesn't necessarily mean there is anything customized, only that they had to make sure they choose correctly between hi and lo - and since it's still impossible for them to tell how it sounds (that's what testing is mostly about, not just specs), it would be natural to pick a good middle ground in the correct impedance area (hi or lo).
And don't forget the following:
One interpretation is that they are giving up on this alleged custom calibration in higher models.
There is a second possible interpretation based on the following:
in that, it might mean they now have hi/mid/low switches to set rough impedance on the fly; and that this is good enough - if that's the case, I'd say yes it's good enough. We have to see the cables to be sure...
Quite the skeptic ... wow ... I own Transparent cables...in the past Ref, Ref XL and currently Ref MM and Opus...I can assure they higher end models are not just high and low...
Are you a owner or a potential buyer? Or just stating opinion....or have you discussed with a dealer or Transparent to get the facts? Might be worth it to be sure...just sayin