Parameter lost in a reduce method?

I was practicing a reduce() exercise and this was the solution:

const reducemethod=(arr)=>{
return console.info(
    arr.reduce((total, num,index)=>{
        total=total+num;
        if (index==arr.length-1){
            return `The acumulation is ${total}`;
        }
        else {
            return total;
        }
    })
}

My question is: why do we have to return 'total' in every reduce iteration? Does a parameter get lost when entering into a condition? (seems like this because if you don't return you get total as a NaN) Doesn't 'total' gets saved in the reduce function even if it enters into the condition? Thanks! Edit : Sorry I got a bad copy paste there, should be fixed now.

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