It doesn't matter if the thrust is created by a propeller or a jet or a turbofan (with the fan being a propeller too). Those graphs, to which I provided a link twice, shows the aerodynamical most efficient speeds.
Why TSFC is relevant is because a jet doesn't run efficiently at the minimum power required. So it's fuel consumption is actually higher at this lower power setting. Hence, the actual speed for max endurance is slightly higher than the aerodynamical one...
A small technicality, that doesn't render the basic principles of physics invalid.
It has nothing to do with TSFC - that only modifies the curves a bit, but the basic physics remain the foundation.
Actually, more accurate - it doesn't modify the curve, but
moves the point where the lower fuel consumption takes place a slight bit forward. As nicely demonstrated too, by the graph in the link you posted.