What you're going to find is that there are dozens and dozens of "gimmicky" cool guy parts for these turbo Buick V6's. By in large they don't do what they claim to and if they do it generally doesn't help at all or worse, masks a problem that needs seriously fixed.
The heated O2 is on that list,it may go into closed loop faster, but by just maybe a minute and besides, that's just one of the flags that needs set before CL operation.
The heated narrowband O2 gets it's power from a piggyback connector for the EGR solenoid circuit if I recall.
In the our world of hotwire fuel pump, alky pumps, etc. I see NO reason to saddle the charging system with a non-essential,heated, narrowband O2 sensor.