Maybe yes, maybe no
Even with semi hard water, it still may be useful to try it both ways. Try it once with the teaspoon of baking soda and once without. I found that at the two week mark, the tank with baking soda (started at the same time, same recipe, same size tank) had twice the bubble rate as the tank with no baking soda.
But, the sort of yeast used does seem to make a difference. I found that bread yeast seems to like baking soda and wine and beer yeast did not. My water is GH 10, KH 8ish, mostly calcium, not much magnesium.
Member AGA, HAS, NASH
110G, 10 adult discus, barebottom with plants on wood
58G, 3 adult discus, barebottom with plants on wood
59G thickly planted tanks, rummey nose tetras, kuhlies
300G goldfish pond outside