Superman and Doomsday are not weak to magic, they are vulnerable to magical effects just like any character that isn't explicitly immune to magic. There is a very large difference between the two.
The sword being magical isn't why it can cut Doomsday. The sword's magical properties specifically being to make it better at cutting is what makes it able to cut Doomsday, just like how Wonder Woman sliced that car in half. The car didn't have a weakness to magic, the sword is just strong and sharp enough to cut through it.
Steppenwolf's armor not being cut by it just means Steppenwolf's armor is more durable than Doomsday's skin. This is hardly a surprise given Steppenwolf is a near-Kryptonian level being. It makes sense that any armor his kind would forge would be a significant step up in durability from their bare flesh. Just like normal humans don't use tissue paper for armor.
Basically just assume Wonder Woman's sword is enchanted with +10 Sharpness, making it able to harm Kryptonians who have natural armor of +5. Steppenwolf's armor just has +15 armor rating, making it able to resist her sword slashes. Arthur's trident has +20 piercing though, and can pierce said armor.
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