Stat spread:
Brionac:
102 Crit / 71 Sks

Gordian Trident:
97 Det / 71 Crit

If you change nothing aside from the weapon and do a parse on a dummy without having a defined time that you will cut the parse (as was done in the test), you're literally comparing 102 crit to 97 det and 71 crit, since sks has a negligible impact on your dps (yay dot tick boost?) outside of letting you connect with more hits in a shorter timeframe.

So yeah, you'll see a huge boost in damage when adding 97 det to the parse. That's effectively 13 additional strength, which is more than +1 weapon damage.

Comparatively, upgrading from Brionac to Halberd of the Heavens saw my dps jump 60-70 on standstill dummy parses, due to the drastically improved stat spread that the Heaven spear afforded me (in addition to +1 wd).