As of today, according to GRU's website, both LH and TP (as well as other *A and non-*A airlines) are still in T2.
About the taxes and other connection details, I have no first-hand experience at all. I did live in SAO/GRU for decades, so I have been to the airport countless times, but never, ever connected there.
All I know is that for regular flights (not connections), it is extremely rare that the taxes are *not* included. Again, I don't know the rules for connecting flights in GRU.
I did this kind of overnight lay-over several times from MUC to GRU with TP, on purpose, just to spend a night in LIS. Never had to pay any extra taxes.