That doesn't automatically ring alarm bells with me RepealTheGRA since that follows many areas of law where in looking for meaning one should have regard to dictionaries but should also think about the use of the word(s) in context.
I'm very pleased to see this decision.
Having written that, I went looking for another report and found this in The Times:
Mr Justice Mitting, the High Court judge who heard the initial claim, said that he referred to the Oxford English Dictionary definition of the verb “strangle” and decided that Ms Stoker’s post meant that her ex-husband had tried to kill her.
...
The Supreme Court justices ruled that Mr Justice Mitting had erred in law by using dictionary definitions as the starting point of his analysis of the meaning of Ms Stocker’s Facebook comment. The judges also found that the High Court judge had failed properly to take into account the context of the post.