It isn’t about preservatives. The EU is more tolerant of potential bacterial contamination and lack of mitigations than the US if the food process is deemed “traditional”.

The specific FDA bans reference relatively high incidences of food poisoning in Europe which can be directly connected to inadequate bacterial contamination controls that would be required in the US. One can say many things about food in the US but their bacterial mitigation standards are among the strictest in the world.

That's why you wash egg shells destroying the natural protection layer. We don't.

Also, lots of food from the us banned there because it can be seriously unsafe for health.

And, finally, please, stop hormonating/self-feedings the chickens. That's why you need to bath them in chlorine.

All chicken sold in the US is free of hormone treatment.