Yes, if your only metric for laziness is ground covered. That's not the only indicator of laziness though, which is exactly what I've just explained to you.
To be clear, I'm not saying Sigurdsson is lazy. It's not the word I personally would choose to describe the issue he has, but the point was that I can understand why people say that. I have a girl who works for me who can spend the whole day working, and appear to be busier than all of her colleagues, and yet to a man they would call her lazy. That's because the work she does is often fairly unnecessary, low pressure, stuff. She'll spend hours shredding, filing, restocking, ordering etc while they're left doing all the work that has deadlines, emailing people, dealing with aggro on the phone. I think this is similar to what people mean when they say Sigurdsson is lazy. The recent Chelsea home game for example, he spent the whole first half running round looking like he was working his socks off. But he hardly touched the ball. When we got the ball, suddenly those lungbusting runs he'd been making forlornly chasing Chelsea's defenders just stopped, and he was back to milling round at the edge of the box while the midfield tried to do something with it. The argument being put forward is that at times like that he needs to do more to involve himself in the game, and regardless of the semantics, I think it has some validity.