a negative bar is done in a vacuum. So those test will be used in high altitude situations. They're also important when graphing the values... but in your situation, they're not necessary.
As far as the positive bar, it shows depth in water. The relation of 1 bar to 33 feet is somewhat true but bar is a unit of pressure while feet is in length. 1 bar is the unit of pressure at sea level. If you go down another bar you will descend 33 feet.
Your watch failed the 10 bar test. It held the 2 bar test but had 74 um of deformation. Unfortunately, every watch is different and depending on the gaskets and construction material, this could matter... but the watch did hold 2 bars of pressure thus why they mentioned you could go down 33 feet.
Test 3 (the +1 bar) should have been done first to relate sea level... but it doesn't really matter.