No-one's disputing your point that he didn't contribute. People are just pointing out that isn't what wage thief means.
If someone at your work is genuinely, physically and medically unable to do their job...they still get paid while they are off recovering, and rightly so.
If someone at your work is completely fine and capable, comes to work and doesn't do anything, sits on the internet all day, terrible timekeeping and doesn't care that everyone else is having to pick up his work...and yet is happy to keep picking up his full pay, that's a wage thief.