An Amiga Accelerator in the traditional sense means a faster CPU and some RAM
i would discuss that. amiga accelerators frequently provided additional features, such a mass storage interface or even pci/rtg interface. which all can be considered further aspects of system acceleration wholesale.
in this respect, and in a lack of tetter word, i dont see anything inappropriate or understating vampire capatibilities in calling it "accelerator". we could call it expansion, but it would also become inappropriate with a standalone system. i think, important is that no harm is meant. thats what matters.