I wouldn't risk that, have a whole tune built on bad O2 info. I had one of those clamp on O2 bungs on an aftermarket tbi efi setup and it leaked.
This X 1 bazillion
2 data points you and your tuner will always want as accurate as possible: the ethanol % the fuel is testing from the pump......and the wideband readings. The tune has to be constructed on a reliable set of data