In general when there is a tax on a good or service, and one pays the provider, one is considered to have paid that tax and to have paid the entity that receives those taxes, merely via the provider, who never owns that money but merely has temporary custodial authority over it. In any event, this issue seems irrelevant, as substantially the same question could be asked by saying why do I have a receipt that says I paid money to AC for taxes that the German govt isn’t going to charge AC and that AC isn’t going to pay. Whether this counts as me paying the german entity is neither here nor there.