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The article is suitable for 30 to 58 mm wide top tube and 30 to 80 mm wide down tube. According to research, the article is intended for MTBs.

Yes, they are rubberised.

is designed for children from 2 to 5 years (up to 22 kg) and can be fitted to most modern mountain bikes with front suspension. However, this seat is not suitable for electric bikes. For e-bikes, the manufacturer recommends the Shotgun Pro Combo seat, which has been specially developed for use with e-mountain bikes. This seat is mounted without frame contact and is equipped with an adjustable leg width to fit wider down tubes of e-bikes.

I don't know. But I don't think so. I would go for the newer model... as the frame must be really thin for this version.

The limiting factor is rather the size and weight of the child. In my experience, it can be used from the age of 2 and then up to the age of 4 without any problems. If the top tube slopes steeply, I recommend the more expensive version with a brace between the seat post and the head tube instead of a clamp.

What is the exact model of the electric bicycle in question? We can ask the product manager. :)