Semantics, schemantics. The tax is not payable during life and the recipients ultimately retain the value of the inheritance less tax. If they can’t afford to pay by other means they will usually sell the property and remit to HMRC within six months. That feels like the recipients paying the tax to me. Either way, the concept of a tax on unearned income still seems reasonable.
It is far from semantics. The inheritors receive nothing until the inheritance tax is paid. The amount of tax is wholly dependant on the financial position of the deceased and in no way upon the financial position of the inheritor.