He's definitely a squatter. If you own something and you don't use it, you're a squatter. I own an old original Nintendo that I haven't used all year. That's why if someone comes into my house and takes it, it's my own fault.
The right of ownership includes to right to use what you own in your own way.
Of course, if the institution's judgement is that people can take things that I'm not using at that exact moment, and it is not interested in intervening, then it's not my 'right' to leave my house alone for the day.
Turns out my rights are entirely dependent on the amount of guns I can bring to bear vs. the amount of guns somebody challenging my claim can bring to bear.