Improvise doesn't reduce the cost, but rather it lets you pay for part of the cost by tapping artifacts in place of spending mana.
But yes, it still works if you're using an alternate cost to cast a spell. (This would work even if it did reduce the cost. What doesn't work is using more than one alternate cost, but that isn't happening in this case.)
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But yes, it still works if you're using an alternate cost to cast a spell. (This would work even if it did reduce the cost. What doesn't work is using more than one alternate cost, but that isn't happening in this case.)