That is similar logically to saying that it is "fact" and "precedent" that a law enforcement officer can't be convicted of violating civil rights/assault/battery because the LEO's involved in the Rodney King incident were acquitted.
More specifically:
Please cite/hyperlink the case.
Please cite where the case sets a precedent that must be followed going forward.
More simply:
Without researching the case, as you've provided no hyperlink, I'll suggest that you seem to be projecting judicial precedent onto impeachment proceedings, with no lawful basis to do so.
You seem to have said to yourself, something to the effect of--if not in these exact words:
Since District Court Judges may be bound by the rulings of their Circuit Court; it must therefore follow, that a current Congress is bound by a previous Congress with regard to impeachment proceedings.
Again, please cite such a requirement? Please site any reliable source supporting your assertions?