re: STOP, STOP, STOP - since when has temperature effected radioactivity decay rate
The rate of radioactive decay isn't being claimed to be changed by temperature. Instead some small percentage of the amount of argon gas held within the rock from radioactive decay can apparently over long period of time migrate through the rock; this seepage rate can supposively increase as the temperate of rock [and argon in the rock] is higher.
If this is true, for example then we could expect that surface rock on Venus if millions to billions of year old would have less argon in it, compared a rock of same age which had same amount of potassium which decayed if instead was kept in cold environment during this time.