Thevenin Equivalent of BJT Transistor
Almost. But not even close.


Zin (base) = ~ hFE*Re so Rb2 is reduced slightly.
Zout (emitter) changes from a current source to a voltage source with Zout =~ Rb/Hfe for AC coupled load signals that draw less current than Ie, otherwise it rises to open circuit for negative AC currents approach the DC bias.
Any further DC load attached to emitter reduces Rb even more but especially also Vbb2 quiescent V.