Australian here, and the differing wording on the site kind of changes my answer. I believe I 'can' but also that I 'wouldn't'.

I'm not worried about theft, but see 'reserving' a seat like that as rude, and 10 minutes as longer than is reasonable.

(Pragmatically – I’m more concerned about having an awkward interaction with a barista that cleared the table and put the laptop somewhere, than about someone stealing the laptop)