Yeah, Radec's level 2 was dodged in that super dodging video they released. I think Sweet Tooth hopped above it and twirled with his chainsaw to stay above it long enough. I'm sure the beam doesn't actually hit above itself.
Awaiting: GW2, Bioshock: Infinite, The Last of Us, GoW:A, Playstation All-Stars, AC3, Watch Dogs, Beyond. PSN: Ambulance-Chaser
You probably can't avoid it in just one single jump. The reviewer probably never bothered to double/super jump, or use an attack that gives you vertical momentum. Just jumping once may not get you high enough to avoid the blast.