mm unsurprisingly your talking about something you have no idea about.
There was no real direct nerf to THF twitch atacking this patch. It still provides a significant boost to DPS.
Yes, indirectly, it is less effective then before, but that's mostly a side effect of removing the incredibly awful 5th attack. Since auto attack is so much better now, the difference in twitch and auto attack is less. Instead of +40%, its about +20%.
Really, the change just brough us back to where we were at BAB12-14 or so (mod2,3,4), pre 5th attack. Twitch was effective then, but not insanely effective as it was in the BAB15+ days.
For me yea in the end it is a nerf. I tested again vs the portal using twitch and it took 55 seconds vs 50 seconds, so a 10% loss in DPS. But keep in mind - ALL attack styles were reduced.
Infact - for the very large majority of players - who attack normally.. THF, and this build just got a significant boost in DPS. It is really the only style of attacking that has gained attacks per minuit this patch.