I've never been particularly enthused about voting, but I don't think Obama-era arguments against it have aged well. At least in the US, the rise of Trump and the MAGA fascists makes "both parties are the same" sentiments look silly and out of touch. I read your follow-up too. While there is some truth to it, I don't think the argument is very solid. You seem to place a bit too much faith in liberal institutions as a bulwark against the fascists.

Overall, "voting isn't very effective, so what else are you doing" is a much better approach on this topic than "voting is bad so you shouldn't do it".