For what it's worth, Clyde was in town a couple of weeks ago and I talked to him about what he is doing now. He is printing his exhibition stuff on inkjet. He says he does not trust silver photo paper of any kind anymore. He says he had conversations with manufacturers who told him several times over recent years that they have had to make changes in the paper because of environmental concerns - so he now uses neither fiber nor RC.
We were discussing his present touring shows, which include prints that are 16x20 or so - not the giant 8-foot photos he's also famous for. He says he thinks his inkjet prints are better than his silver prints. I agree with him, although maybe not for the reasons he does. I think he does a better job of controlling the contrast in Photoshop than he does in a wet darkroom, but that's just my opinion.
I have heard the story that he had to replace a large number of prints years ago. I don't remember whether he replaced them with fiber prints or more RC, though.
If you ever get a chance to go to a show and talk with him, do so. He's a very nice guy and very willing to discuss his methods. He also enjoys talking about Florida's environment and wildlife.