If it's true that you can grab a Cellebrite hardware piece without too much difficulty (Ebay, etc - and note I'm not speaking from expertise so someone please fact check me), I'd find it hard to believe Apple wouldn't have done this kind of inspection themselves and/or noticed those DLLs being shipped.
I am reasonably confident that Apple is a Cellebrite customer. Their security team certainly has access to forensic tools from other vendors. That team also spawned BlackBag Technologies, which is now part of Cellebrite.
Curious if there'll be a response of sorts.