Armor restriction was applied to every class obviously, but it hit seekers hard. DPH seeker is predictable and easily countered if you have any sense of 1v1, stop bluntly complaining you look ridiculous. Burdette knows how screwed seekers were, they were complete garbage in both aspects, 1v1 and MPK. In dragon 1v1 a seeker will get demolished by WR and WBs, due to lack of CC and damage. Seekers got power spikes, which again can be countered easily.
A video does not prove anything, I have done fights myself and a barb with HoS is unkillable as DPH seeker. The proper approach would be to reduce few def levels, other than that seekers are in a viable spot, which have not been for a long time. Puzzling is the fact that Agatio shows up in a seeker related thread, he probably had a revelation while sleeping that something positive happened to seekers and rushed to log in.
