That article is pure speculation and is pretty much worthless.
It's claim that the Secure Enclave is comprimisable is based on Apple releasing a firmware update that "increased delays between passcode attempts". From this the author then assumes that Apple then has the ability to "disable passcode delays and auto erase". There is no evidence for this. And there are plenty of other scenarios like their being a hardware minimum attempt delay, auto erase not being possible or the maximum attempt count implemented in hardware.
http://blog.trailofbits.com/2016/02/17/apple-can-comply-with...