Were the colosseums used for what we thought? Electrical power plants?

So, here is this video it's in croatian, but has english subtitles, the guy has an interesting theory about colosseums, I don't know where he got all the ideas from, but it's interesting. I'm wondering what y'all here think about it.

It’s interesting- but there is Roman documentation of gladiator combat, including mosaics depicting gladiators- so I am not convinced gladiators “never existed”-and what electronic devices would have been powered by these coliseums? I would think that if the Romans had such devices some record would be left? I am no historian, nor knowledgeable regarding the subject discussed, merely curious as to how the research was done?
 
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