No, you're definitely still using an ad hominem fallacy, regardless of your attempts to justify yourself. You're not addressing any of the evidence, but rather addressing a perceived bias.
The site definitely has an axe to grind, and I'm certainly not condoning or supporting the commentary on this, but it does clearly illustrate shots from the video that certainly look like people carrying weapons. Don't let your bias against a source destroy any useful value. Take it with a grain of salt, yes. However, examine each case on the merits. I'd wager we wouldn't find much else of value here, but that's no excuse to throw the baby out with the washwater.
Example: I think the major political parties in the United States are a bunch of whack jobs pushing their own agendas rather than what's good for the country in general. That doesn't mean I'm going to across the board ignore every idea the have to say without evaluating it because of a "consider the source" attitude. Again, it means taking careful evaluation of the idea or evidence, but throwing things out indiscriminately because you don't like a potential source is exactly what's wrong in politics.
I wonder what your response would have been had I simply cited the times in the video of the weapons shots, rather than just linking somewhere that had the times and the stills...