That leads me to interpret him as saying that at least one of the transmutations has been observed to produce significant heat.
Sorry -- my imagination doesn't carry me beyond that... I suggest you watch the video for yourself -- even with the audio off if you can't follow Iwamura'a "JEnglish" -- because his slides are primarily where the information resides...
Thanks for the response, but showbiz doesn't impress me at all in this field. I'll wait for the specifics.