It doesn’t need to be flexible. It just needs to move, extend and overlap, so as to maintain protection, something armorers had managed since Roman times.
OK ... seriously ... that stuff is flexible for all the wrong reasons. It’s composed of carbon chain molecules. Expose it to a hot plasma, and it will burn up. What’s needed here is a flexible refractory material.
Perhaps a mat, several layers of fused quartz fiberglass? Melting point is 2200C, reentry temperatures get into that range.
I’m not a materials scientist, and I don’t play one on FR.
You obviously have better materials knowledge than I. I merely suggested that a flexible yet plasma resistant material be used so that exposed joints be better protected but I suppose SpaceX has already or IS already exploring this.
It doesn’t need to be flexible. It just needs to move, extend and overlap, so as to maintain protection, something armorers had managed since Roman times.