If you are going to purposely increase your humidity (by pouring water directly into the substrate, ideally under the basking light/heat source) you certainly do not want to let your temps fall low---50-60s + constant humidity= can lead to an ailing tort....Now, if you have a tort that you are not going to add constant artificial humidity to the enclosure then I completely agree here with some species enjoying/tolerating the cooler night temps....but would never mix those low temps with artificial humidity in the enclosure for any species of tortoise....
I did not recommend higher than 80 during the day, I simply stated to also leave basking spot as is so the tort has that option remaining in the enclosure....
