I didn't hear anything suggesting he used irons, that'd be a very odd choice. Most modern ARs don't come with irons or an optic and you can get red dots much better than just irons for under $200.
And irons would decidedly be harder but 100 yards still is very achievable by a novice who follows fundamentals.
I'm the odd man out here. But I don't see the issue here. If the shoe was on the other foot and Biden got hit in the ear, and the Democrats did this to show support to Biden people here wouldn't deride them as they do the Republicans here.
There's many things these politicians deserve criticism for, solidarity for someone having been hurt isn't among them.
If Harris got cancer we wouldn't mock senators wearing little pink ribbons.