It appears the hot spot is even warmer than thought. Rhe latest pass recorded temperatures up to -135 F against background temperatures colder than -300 F. So it is likely even warmer below the surface. There seems better correlation between the tiger stripes and the geysers. The main content seems to be water vapor that is jetting out and carrying very small ice grains along with it.
The very local high heat and vapor jet energy may not bode well for the friction scenario. One might expect larger variation in ice grain size in a friction scenario as well. A vapor wind density jet might show a narrow range preference for available ice grain sizes... a sort of Goldilocks just right size to go with the flow rate and vapor density.
There were no reports at this time regarding surface gravity readings that could sort between near subsurface lake, subsurface ocean, diapirs, or assymetric or binary core scenarios for tidal heating.
Also not yet ruled out are radiogenic sources of heat. While an indigenous internal radiogenic source is puzzling since there is no geyser activity at the other pole or even elsewhere on other moons to this extent, there still remains a possibility that an impact of piece of another planetismal that differentiated prior to being impacted or tidally rendered by passing within a Roche limit may have lost a portion of its more radiactive core that eventually hit Enceladus. Enceladus is too small itself to have garnered enough long lived radio-isotopes and condense and isolate them close to the south pole. Even if Enceledus did differentiate, there is no obvious reason why the denser long lived radio-isotopes should migrate towards the surface of the south pole in particular.