instructrtrepe's document has this to say about the status effect hit rate from that routine:
Let N1 = (0..99). If N1 < Status Hit%, inflict Status Effects.
I see no talk of levels or magic evasion in there. I think the reason we kept misunderstanding eachother is that I assume that routine to disregard the target's stats and merely look at the RNG (which is why I keep talking about 'flat' or 'static' percentages) and you assume the basic magical hit rate routine (as used by, for instance, the Sleep spell) is called 50% of the time by attacks like Dust Storm, etc.
If you had missed my edit, I'm simply saying they added a new algo specifically for the new spells to add magic evasion as a factor of the status being applied. They did something similar in FF4A, but I don't believe they did too much of that in FF6A (just one specifically new spell IIRC).
It's as simple as this...
If target resists status, skip status affliction determination step.
Let N2 = (0..99)
If N2 < Evade%, the status effect is not applied; do not follow any more steps.
[/edited for simplicity]