That's from last year. When rumours about a possible new Red Dead showing at E3 were at an all time high. This justification of Red Dead not being at E3 because "it was cancelled last minute" probably comes from a well known bullshitter called Raiden. I just can't find the post now but if you go to /r/reddeadredemption and search for "Raiden" you'll know what I'm saying.
https://www.reddit.com/r/reddeadredemption/search?q=raiden&restrict_sr=on