If you actually read the interview, both Yoshi-P and Matsuno say what happened with Bozja.
https://www.famitsu.com/news/202109/27234807.html
In Japanese, I used translator https://www.deepl.com/translator
In context of the Field Notes having flash forwards:
He also mentions that the epilogue ran too long and repeatedly mentions that his writings ended up getting cut due to time for being too wordy and that he often took a long time. He also kept coming up with ideas that he felt were too close to other content and decided against using them. Like how the original idea was for the content to take place in Dalmasca and using time travel but he felt it was too close to ShB's main story so it was instead moved to Bozja and the 5.25 content was made off of his unused ideas for Vagrant Story 2.Matsuno: Yes, that's right. Since there are no plans to do so at this time, I wanted to at least mention that Dalmasca has been liberated, so I included it in the War Results Record Book. However, now that I have finished "Save the Queen," I feel as a player that I don't need any more war stories. After the "Battle of Werlyt," I thought, "Dalmasca has been freed from the hands of the Warrior of Light, chan chan! And that was the end of it (laughs).
Yoshida: You asked before. If you were going to do it, you wanted to make it an adventure drama like the one in 5.25.
Matsuno: When I think about the feelings of today's "FFXIV" players, I felt that a war story would be different. There are several reasons for this. One is the current world situation. The world has become closed due to the Corona disaster, people are fighting each other on the Internet, and various things are divided, so it is not a pleasant world. In the midst of all this, one wonders what it would be like to impose even more stress on players in the form of war.
At the end of patch 5.55, there was a line from Fran, "See you in Dalmasca," which we were actually going to remove. I was actually going to delete it, but I thought that if I replaced it with "See you in Dalmasca when peace is restored" instead of "See you next in the Dalmasca Liberation War," then I wouldn't have to delete it.
Yoshida: I see. So you are saying that there will be more adventures and battles, but that we will meet in the new future. I think this is the last part of the story, and I want people to think about it in the aftermath. Fran also left some things unspoken and swallowed. I would also like to see what happens in the episodes that follow, such as why Lyon does what he does, in the adventure that Matsuno-san describes.
I wouldn't count that as a rewrite though, unless it was fully written out. Otherwise every single time they throw out unused ideas would be counted as a "rewrite" when that's a normal part of the creative process.
As for Garlemald, Yoshi-P states in the interview that even back then in the writing phase for Bozja, he wanted to depict Garlemald being torn apart by the different legions and that was the story beat that he gave to Matsuno to base his own story off of. From my own perspective, it was too powerful to be fought against without deus ex machina so it was always destined to be off-screened or demolished by a primal and it happened to be that it was partially both. I certainly would've liked to have visited it in a manner like FFXII, but FFXII had the advantage of having a friendly imperial with power who isn't a defector written into its story from the beginning.
Where did he say this? Matsuno said in the interview I linked that he actually saved a character that was meant to be killed. The person Matsuno did say he wanted Yoshi-P to kill off was Fordola, back in SB. But Matsuno was speaking as an outside observer of that, not as a member of the dev team, which he wasn't a part of at the time.