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But those fibers disturb the crystal lattice of the ice, so surely there is some tradeoff?

Alloying copper with tin to make bronze produces a material which is stronger and more durable than either component, and this works because the tin disturbs the copper's crystal lattice, which restricts the mobility of dislocations, which in turn reduces the plasticity of the alloy.

I do not know if cellulose fibers have a similar effect in ice, but in general, if you can trade the feature that is causing a problem for one that will not, you are improving things.

Aka it makes it less brittle, which ultimately makes it stronger?

It makes it less ductile, which means it's harder and more resistant to deformation. Bronze is more brittle than copper.

Adding fibres to already brittle materials improves their resilience to tensile forces mostly

So you’re saying it makes it more brittle? Because the opposite of ductile is brittle.

Or are you saying it increase yield strength, because that is a separate property, yes?

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