Too ambiguous, imo. And even if the person picking him up knows that Clark is Superman, that doesn't actually stop them from commenting on how heavy he is. That's just a natural reaction especially when Clark has gone limp, thus letting all of his weight go.
And it's not like other characters aren't aware of Clark being a big guy. Trish Q in Action 1001, without touching him, comments on how large Clark is.
Incidentally, this implies that Leviathan's suit has not augmentations in the way of physicality, and he has no innate super strength. That actually rules out Ramsay, thank goodness. Ramsay, as a totally unnecessary wiki search tells me, has super strength and durability. Don't know the deal with Mark, aka who-on-god's-green-earth-possibly-could-care, and on principle I refuse to wiki search him.