a standard attack is a standard attack.

the "special" standard attacks, would be the passives that replace a standard attack if certain situations prove available at the time:
- like naruto, his standard is to call 2 clones, if there are clones on the field he will then attack the opponent and cause low float
- gnw kika, his standard can do a triple combo and knockdown, if akamaru is on the field he will do knockdown without needing the combo (i guess? don't have him yet, normal kiba doesn't have the passive)
- kankaru and gnw kankaru, his standard causes poison, if he has a puppet it will do low float and ignition or poison depending on the version you use
- kakuzu, his standard attack has a chance to combo and cause high float, if a friendly unit died he will garantee a repulse instead
- maybe others that dont come to mind at the moment

this atacks bypass hinata's mystery because they are not standard attacks they are passives that replace the standard attacks, its not about key words as you mentioned
the fire main standard attack doesn't fit this discription and so it shouldn't bypass hinata's mystery that clearly states and i quote "if standing in the first rank, it will be the only target of the enemy's standard attack"

bumping it up so it wont be forgotten

so the ignoring on this 2 skills are related to the taunt? i always tought they ignored the opponents defense and resistance.

if that is the case the skills are working correctly, but the wording of the skills should clearly say it ignores Taunt and not defensive skills, because that would mean ignoring stuff like super armor, neji's and hinata's dodge, kimimaro first atack dodge and so forth, wich they dont at least not always