ELI5 inner tubes impacting roll resistant

I am tubeless and carry a TPU tube as a back up. I primarily carry it because of its packing size compared to butyl.

I went down a rabbit hole about different types of tubes and their impact on roll resistance. The articles compared butyl, latex and TPU. I understand how the tires and weight can impact roll resistant.

When comparing tubes specifically for roll resistant the ranking was latex, TPU and then butyl. The latex were often a couple grams heavier than the TPU but had better rolling resistance numbers

I don't understand the physics (?) how the tube material actually impacts the roll resistant. Tire tread pattern and material makes sense. But the tube doesn't make contact with the ground. In the article posted the latex is 80g while the the TPU are 22-40g. But latex has better roll resistant

I am already tubeless and I am not going to replac my TPU backups. This is just a request to understand

The article compares road tubes but should be the same

https://www.bicyclerollingresistance.com/specials/tpu-inner-tubes