Nails are not used in most old Japanese buildings. That is because the expansion rate of each material is different, making them vulnerable in the long run. In the past, the Japanese built shrines and temples with hundreds or even thousands of years in mind.
The English script for this episode can be found here. This will surely help you understand this entire episode. https://toralog.jp/podcast-episode82/
I introduce my hometown in English on YouTube. https://www.youtube.com/channel/UCJyb6vceAjGazPPGjJs-1Yw It has Japanese subtitles, so I think it'll be useful for your study! Please take a look at that as well!