This is true. Despite having Lewis at the top of my own ballot, her being Jamaican wasn't a factor in my decision because I knew the Liberals and NDP would aggressively attack her for her social conservatism anyway. Even if they can't call her a racist outright on grounds of her skin color (very unlikely), they'll still call her retrograde, a neanderthal, etc.

But I think it does make it easier for the right, as much as one can say it exists in this country, to counterattack and make the left look like fools - and, just as if not more importantly, for the normie voters to see that.

Of course, your mileage might vary, in Lewis' case it certainly helps that she's quite charismatic and (to use a Bidenism) articulate as long as she isn't speaking in French; my outlook would've been less optimistic were she as sleepy and quiet a candidate as Ben Carson.