The pic is from the Arnold Classic 2001, arugably Ronnie's best ever form.
And there is no evidence that Ronnie has done anything with his calves.
the only reason they do not look as small as they usually do in that pic is that Ronnie's thighs were not yet the size of tree trunks.
If you look at other shots of the AC, you will see that Ronnie's calves still, as always, sucked.
keep in mind that is an unusual angle to view the calves from.