This is how the meme is trying to generalize the term, yes. But historically, and especially in our current political environment, antifascism typically refers to a specific leftist movement. You have heard of antifa? Antifa is short for antifascist.
What I mean is: It is not a lie to use the word “antifascism” in a general way, but to unnecessarily specify left-wing antifascists when that is already the common understanding, you explicitly contrast them with supposed right-wing antifascists, which are conveniently not placed here on the chart... See my point? It reads like it’s innocuous, but you come away with an altered understanding without even realizing it. It’s a very effective and subversive disinformation tactic.