Perhaps the cinestill guys got a few 200T short ends in their last batch of film....
BTW, I was a great fan of using ECN film back in the days when there were many suppliers who would provide it. Here in Canada there was a place called C+L labs in Richmond hill. Biggest in the states were Dale Labs in Florida and RGB in Hollywood. These labs would run the film in real ECN-2 Process and print on mostly eastman colour print, although some used Fuji or Agfa Print film. I even shot a bit of AGFA XT Negative which was AGFA's Movie Negative.
Looking at them now, some of the early ones have bad fading in the slides as the Kodak stock at the time was made with the assumption that it only had to last a year in the Theatre circuit. But then the LPP stock came out and it has held up.
I also played with home developing using a mix it yourself chemistry using CD-4. but never too seriously.