If you heard about the #StormontBrake threat from #PhilMoorhouse then you have been seriously misinformed. Unfortunately, from past evidence, M. Moorhouse does research via Twitter & Twitter-facing-journalist, rather than directly.
BBC News points to the NI Assembly report on the EU law change:
If M. Moorhouse had only *read that* xe would know a whole lot of things that xe says xe couldn't find out about from any source.
Such as: