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No. It needs to squeeze against itself to move blood to and from chambers.
Could it not just sorta flex the tube? Like couldn’t one part of the tube pull on or press off of the next?
As someone who flexes the tube very often, I would guess that the heart would start pumping unwanted fluids
No. This diagram doesn’t show how they got the heart to unravel like that. There’s a layer or wrapping around the heart and internal connective tissues that holds the heart in its traditional state. I’d imagine if the got the muscles of a unrolled heart to contract it would just fold or bind at points. But definitely wouldn’t pump anything.