The Slab requires context, but we can analyze the assumption. https://image.pollinations.ai/prompt/high%20tech%20trading%20card%20analysis%20chart%2C%20A%20futuristic%2C%20polished%20black%20slab%20hovering%20over%20a%20schematic%20d?width=1024&height=576&nologo=true

That demands a fairly complex answer, but since they use the blind oracle, it's worth thinking through. My short answer is, I think it is unlikely to pose any attack surface unless there's something really wonky about the blind oracle. And even then, I think if one was using a BIP-39 passphrase, you'd be in pretty decent shape.

But it is imperative that you decide this for yourself.