It _did_ trip a lot of BS detectors.
The sound was drowned out by the overwhelmingly non-technical consumers of the game's PR. It's the modern day version of selling snake oil.
Technology progresses, but human nature doesn't.
And much of the expectant player base didn't want to hear anything negative. Reddit was a complete echo chamber, praising the devs in every post. I suppose it's still an echo chamber, but the conversation has... drifted the other way.
This should've tripped everyone's BS detectors. Why would a studio do the huge work to add a multiplayer mode if it would be so rarely seen?