There are currently two mistakes in the Dawnflower Dervish bard archetype's abilities:
Mising simple weapon proficiencies: They trade out their rapier & whip proficiencies for scimitar proficiency, similar to the Dervish Dancer's weapon proficiency modifications. The Dawnflower Dervish Weapon Proficiencies ability should grant weapon proficiencies AUTO:WEAPONPROF|Scimitar|Longsword|Sap|Shortbow|Sword (Short)|TYPE=Auto ABILITY:Internal|AUTOMATIC|TYPE=WeaponProfSimple. [It should also be named "Weapon and Armor Proficiency" to match the official feature name, but this isn't a strict requirement.
Meditative Whirl is obtained at level 8, not 18. Prerequisite should be PRECLASS:1,Bard=8.
Apart from this, archetype features don't show up in the Bard Class Feature list on the Class Features tab. I believe this was semi-intentional due to it only being a quick implementation, but it's somewhat annoying. Currently working on fixes (and updating the archetype to show its class features in the Bard Class Feature list), I'll attach them in a simple text file when complete.