RayV wrote:
Short story made long, my BIL's breaker feeding his pool house kept
tripping. The Black wire was causing the breaker in the house to trip
so I...

Cut and capped the Black wire on both ends
Left the Red wire alone (connected to power on both ends)
Taped both ends of the White wire Black and connected to power
Taped both ends of the Green wire White and connected to nuetral

The pool house is fed by metal conduit (30 years old) that is not in
contact with main house panel.

So now the pool house is 'grounded' via the conduit and the house is
grounded but now they are not sharing a ground.

Should the nuetral bar of the pool house now be bonded to the box
since the box doesn't have a ground running back to the main panel in
the house?

There is zero chance of pulling new wires because of the number of
bends required to get to the pool house and the size of the conduit.

That is now FUBAR. Call an electrician or at minimum, get some professional
advice. You are so wrong on so many points it could be a very real problem.