This video is not for RDR2 developers, lol.
Seriously guys, No Such Thing as game being patched for story mode and I am 99.9% sure. (let's never say never, lol). My reasons:
1. The game has been around for more than 5 yrs and it has been a super big hit. If you were developers, you wouldn't spoil the fun for your fans.
2. All the glitches found don't sabotage the balance of story game mode at all. More new gamers will even be drawn to buy it.
3. The Angelo Bronte Glitch has always been there. To my knowledge, it was patched to current state, which is still a big benefit. It means they love Arthur, too and want us to be Arthur to explore the whole map, too (hatoff to developers for doing this)

BTW, the complete guide of this Strawberry Roan horse    • RDR2 How Arthur gets Strawberry Roan...