Strangely, potency up means that it ups their potency
But seriously, it has a percent increase as stated above. It would be nice if it was more like tenacity up/down in that it would apply any and all effects with each attack.
It's actually +50% (additive) as you can see here: https://swgoh.gg/characters/kit-fisto/ability/turn-the-tide
Keep in mind that no matter how high your potency is, it never lowers tenacity to less than 15%, so there is always a chance to resist.
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I've seen it used to solo the first two tiers on Heroic. I think that means less these days, but it's still useful.
But seriously, it has a percent increase as stated above. It would be nice if it was more like tenacity up/down in that it would apply any and all effects with each attack.
It's actually +50% (additive) as you can see here: https://swgoh.gg/characters/kit-fisto/ability/turn-the-tide
Keep in mind that no matter how high your potency is, it never lowers tenacity to less than 15%, so there is always a chance to resist.