True, but it is up to the Parliament to decide whether the deal is good enough or whether Theresa May should negotiate a different deal. It actually empowers the UK negotiators - they can always agree to a demand in principle, but say that the Parliament would never allow it. US negotiators do that all the time.
Without it, UK government negotiates alone.
How about if it subscribes to an ever closer union, abandons the rebate, joins Shengen and agrees to join the ERM and eventually the Euro? I'm sure Germans would love it, and would be able to secure the necessary votes. As impalpable as this may be to the UK, it is obviously vastly superior to WTO rules, a trade war and tax and regulatory race to the bottom promised by the PM. Not all of these concessions would be necessary to keep UK in EU, I suspect. Shengen and maybe a reduced rebate would be enough. There is no reason for UK not to be a part of Shengen any more anyway.
McHrozni