I'm sure we can all agree that the word "archival" is not particularly concise, but I think we can also agree that one year falls outside of the loosest definition of the word.
I have a client that had a number of prints on canvas made over the last several years on an Epson 9600. She is dealing with multiple clients that are asking for replacement prints due to ink fading. Some of them are only a year old. One or two of them might be attributable to a poor choice of display conditions, but I don't think that they could all be accused of displaying them in direct sunshine. The client is an artist that had them shot, printed, clearcoated and stretched by a competitor of mine. He is refusing to make good and the client is having to foot the bill herself to save face. I don't know what exactly he did, but he allegedly used a third party inkset. Fading issues are largely a non-issue these days, but not unheard of.
I'm reprinting another group of paintings on canvas for a different client (who used a different competitor) that have patches of ink falling off of the face and edges. Those are only about two years old.
I'm going to employ the word "archival" at bit longer, at least. Personally, I couldn't sleep at night worrying about untested materials and their longevity. The cost savings aren't worth it. I'm happy knowing that HP's R&D budget was well invested in terms of ink longevity.
BTW: These were full color images, so I don't know what inkset might be at fault.