Recently I realized that just at the point the wood supports meet the trunk, that there are roots coming out and down. They mostly follow the inside of the now 2/3 rotted trunk. I think they may now be holding up the weight of the plant. I don't think they can support it against wind or snow weight. My supports do that. In summary, it appears that the roots have cannibalized/replaced some of the lower rotted sections of the trunk.
I'm glad it's still alive and hasn't toppled over. I'm adding a Pygmy-date-palm-like grove of additional Y. Gloriosas around it so the spot won't look bare if it does topple or die.
After seeing South Beach FL palms with lights on their trunks, I did the same thing with this plant but it is in MD. It looks nice at night.
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Photo of the roots that begin half way up the trunk: