I don't know the game, flew totally under my radar, don't know much feedback either.
The explanation sounds a bit weird, but while some devs really create their own bubble and can't fathom that someone that goes in blind might just not get whatever genius idea they had, there is also some truth to gamers hate as some sort of sport.
eg Brutal Legend was imho an awesome game, but the game undeniable confused people and many did not get it at all.
Concord is probably not even a terrible game, not a total failure as the almost immediate shutdown suggests, but just not something the market wanted (right now). Certainly no Gollum like unfinished desaster, but being a major Sony release, it got much more (negative) attention and was just hammered and laughed at.
Online is pretty hostile now I think. Back4Blood or Evolve got some negative feedback back then, but were not destroyed, APB or Hellgate London were both flops, but somehow got revived. Somewhen after Avengers people kinda got into trashing everything that is not super great. Any dev or publisher wants some Gaas pie, but average stuff absolutely gets hated if not perceived as great. I am not much of an MP guy, so Arc Raiders, Marathon, Concord, Payday, Fairgames look practically all the same to me. Repetitive loops. But the mp crowd is just brutal in picking their favorites.