Ah well, @r0kk3rz beat me to it.
If you had managed to read thru the aforementioned article you'd seen that to get to the recovery console you need to input the device PIN.

Granted, you are probably able to brute-force it, given there are probably just 00000...99999 -> 100k combinations there. (I don't remember if it allows use of longer lock code...)

So, assuming you build a small HW adapter that you can use to power-down/power-up the device automatically when it halts due to 3 wrong try's, and hook it up to a script trying to force it.
Let's say you will discover it on average by the 50000's try;
If it takes about 30 seconds to boot, and you can try 3 numbers per round, you will hit the right combo in 30/3*50000 seconds, that is actually a little more than 5 days and 18 hours.

So, yes, it is breakable if you want to invest a bit into it