you forget to count in elemental damages etc.
True Multi hit have elemental damages and crit rate counted every hit. That includes Crit damage.
Fake Multi hit if you don’t crit that it. your damage is rip.
Basically Assuming you crit all with 100% crit
fake multi hit, Crit damage 500 for e.g Elemental 200 damage
Redel does 5k per slash on crit
5 slash = 25k
100% Attribuite
50k + 500 for crit damage +200
Real Multi Hit
5 slashes,
Each Slashes that crit does add in crit damage and elemental damage.
so 5k X 5k X2 + 5 X 500 + 5 X 200
which gives you up to 50k + 2.5k + 1k which is 53.5k
If upgrading turning it into 10 slashes. Means True Multi hit will gain up to another 3.5k Extra damage as compare to your damage spread to 10 hits.
Which the difference will be between real and fake multi hit.
Fake multi hit --> 50700 dmg in 10 hits
True multi hit --> 57k in 10 hits.