If someone says that they may or may not do something and will, in fact, decide in the future then that is not a commitment. So why call it a commitment?
Because that is what the EU is doing.
House of Lords legal adviser on EU matters is Paul Hardy, who previously worked in Brussels, plus they heard evidence from 3 other experts.
The link you provided shows that lawyers are fascinated by discussion of who has juridstiction, but contains no view on the validity of any EU claims.