Thank you for the submission
MineTrapCraft . We do not add additional flags to Discontinued or Unobtainable trophies, because they can no longer be obtained in any fashion and would get filtered into other functional trophies with those flags. These trophies were already marked as Discontinued, and as such we have not applied the flags suggested.
In the very, very longshot chance that these achievements become obtainable again in the future, we will re-apply the flags you suggested when we remove the Discontinued flags. Thanks again for the submission.