Christopher McQuarrie shoots about as straight as they come. The guy doesn't BS, and he's been in this game for a long, long time (his very first script was The Usual Suspects, if that tells you anything).
Also, as much as I like MakingStarWars, and appreciate the way that guy does what he does (i.e. piece together plot morsels in a fun, non-cocky way), it's worth clarifying that Jason is nothing more than a very passionate FAN. The guy doesn't work in the movie industry, isn't anything close to journalist, and even though he has gathered quite a few legit sources over the past few years, it's a whole other skillset to be able to assess and translate what he's hearing in a viable, accurate way. In other words, he doesn't have the experience or knowledge to properly filter and analyze a lot of what he's hearing in regards to the reshoot drama. I'd trust him for actual plot info, but never for behind-the-scenes stuff like this. They're two completely different things. I don't doubt that something is going on with Rogue One, but there's not a chance in hell they're re-shooting 40% of the movie this late in the game.