It used to scale off haste very simply, just multiply by your haste + 1. So the old 0,53 with a fairly normal haste of 30% would become 0,69. That becomes even higher with haste procs. So no, putting it at 0,58 and no longer scaling off haste is not a buff unless you have less than 3,8% haste... And that includes raid haste buff.
All trinkets are nerfed massively by this. Not only is uptime roughly 30% lower on average, but you also no longer have increased chance to proc during haste buffs, which is likely where you want your procs most. On top of that the pull protection of 90s is nothing. There is not a single trinket that has increased chance to proc on pull. All it does now is allow you to start with 90s banked. To give some perspective: the new trinkets have 0,46 and 0,51 RPPM, which means it takes about 3 minutes before the chance to proc even starts going up. The chance they proc in the first 30 seconds is only roughly 1 in 4.