Yes but it’s made up. For example they assume random shipping costs and include that in the calculation. And it‘s always 15-18 EUR „processing fees“ from the courier included.
I have some experience with buying stuff from Japan (to EU).
With normal slow post, Japan Post, it arrives at normal Post in my country.
The import tax is about 30% for things like guitar pedals. Or at least it‘s supposed to be 30%.
Sometimes the package slips through and there are no taxes at all, sometimes they look up the worth from the declaration and calculate it quite accurately.
But DHL and FedEx, they just make up stuff.
For example, one time I purchased a 100 EUR guitar pedal with free shipping from Japan.
The worth was declared properly from the seller. But DHL just doubled the worth and added random shipping costs. I had to pay over 95 EUR additional fees on arrival.
Another time the eBay seller declared as „gift“, FedEx asked me for proof of value, eBay and PayPal screenshots. Which I delivered immediately. Then they kept the package for 4 months and finally charged again random customs by adding made up shipping costs and made up product value.
It’s all quite frustrating and I avoid importing stuff from outside the EU by now.