I can confirm that they went with Red Dead Redemption 2 for marketing purposes. Which is, well, why you name something at all. Pretty crazy, right?
But I digress. Point is, I had a big ole chuckle to myself when I saw it, because of people like you
And for the hardcore among you (you know who you are 🏻) Red Dead Redemption was named as such to seperate itself from the original, as it was a completely different game (and the original was shit). It's just good marketing, and as @mudslinger will tell you, marketing is important.