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https://www.warhammer-community.com/2021/12/29/nobody-is-safe-from-the-awesome-power-of-the-tau-empires-new-and-improved-railgun/

Each time an enemy unit shoots or fights, after it makes its attacks, if any models in this unit were destroyed as a result of those attacks but this unit was not destroyed, this unit's reanimation protocols are enacted and those destroyed models begin to reassemble.

Does the Submunitions Stratagem allow Reanimation Protocols to be used? Is it an attack?

It's not made with an attack, so no.

Indeed, it's explicitly instead of making attacks.

Agreed.