Looks like you're right!
https://movies.insidepulse.com/2010/05/12/disc-news-rambo-extended-cut-on-the-way/
Oooh, 80 minute production diary with Stallone, awesome, I'm going to enjoy that. I loved watching the movie with his commentary, he gave a lot of nice insights into the production, aside from being a Rambo fan, it's one of my favorite DVD commentaries, I like when you watch those and get valuable information on the movie, some just suck, like Rambo 2, the director just sits there calling out what's happening on screen as if a blind person were watching, he was like the John Madden of movie commentary, thanks bub, I can see that with my eyes