I interpret this as more of a political statement, rather than something you'd actually want to rely on. That said, it looks like this is just reusing an exist

I interpret this as more of a political statement, rather than something you'd actually want to rely on. That said, it looks like this is just reusing an existing off-the-shelf autoinjector used for insulin. If it fails, you could remove the needle and inject manually. The biggest risks I see here is making sure the epinephrine stays sterile, and that the dosage is correct. (To be clear: Either of these could have serious consequences.)