Yep, pretty certain that's the case. If you look at the braiding of the sheath, it's cross-woven. It expands to slip over the tubing, and wouldn't do anything to resist expanding outward if the tubing core expanded (the expansion we're talking about it TINY).
A high-pressure hydraulic line, on the other hand, typically will have a spiral-wound reinforcing wire which actually does reinforce/limit the line's expansion.
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