Jelly fish UFO is not changing color/temperature

If we analyze the background of the jellyfish video, we can see that the background structures are changing color similarly with the jellyfish changing color.

I have used the youtube video from Jeremy Corbells YT: https://www.youtube.com/watch?v=7bns_WhNAQM

at 11 seconds in, we can notice a brick wall/structure. the wall changes from dark to light at the same time the jellyfish changes from dark to light.

I presume this thermal camera has an auto-exposure, similar to how digital camera uses auto exposure or auto white balance.

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dark wall/dark jelly fish vs light wall/light jellyfish