Do you think his Lordship is on the Board for the Plain English Campaign Bovery ?
The problem with the internet (well one problem) is that it's created a circle jerk of moronity where a bunch of cretins are egged on by idiots in believing they are somehow more right that those that actually did the fucking long hours needed to get a qualification. The paradigm being "Freeman of the land" bollocks that's become so popular.
The reality is English law has for a very long time been predicated upon the everyday use of language. If there is a need to create a specific definition then that has to be done within the wording of the act creating that offence. So unless a word or term is specifically defined, then the law reverts to "everyday usage" when being interpreted.
"Public" is a good example. Some acts - in particular Road Traffic Acts - have to specifically define "public" in a way that extends the everyday usage.
So here, the judge is simply applying first term legal theory to the case, as is right and proper. And as with a lot of freeman bollocks - reality has a chilling effect on fairies.