Wait, how would hardware be possibly leaky? The encryption/decryption can leak data, sure, but that's unrelated to FHE. If your hardware can leak info about the plaintext on the side processing the encrypted data, then you could do the same in software anyway, and the FHE scheme itself is clearly broken...
It's clear v4dok doesn't understand how FHE works, maybe due to confusion with enclaves like SGX. The hardware isn't able to leak the plaintext because it doesn't have the key; it executes on the ciphertext.
The hardware is not relevant if it's simply being used as an accelerator. FHE reveals no information about the underlying data, so the privacy leakage is the same, no matter if you're running the FHE code on ENIAC or on a modern supercomputer.