Sadly, this means the previous "a Wookie got diarrhea" explanation is no longer canon.
The Problem is ...
On one hand, this addition to the franchise makes a tremendous amount of sense, explaining away something that's bugged both nerds and exhaust engineers for decades. But solving that little mystery creates a lot of other issues. For one thing, it makes the Empire look like a bunch of dum dums.
Think about it. Rogue One ends like 20 minutes before Episode IV, and the Empire spends almost the entire movie trying to puzzle out if their engineer is a traitor or not. By the end, it's pretty damn clear that Erso did compromise the Death Star, so why the hell do they keep using it? Especially baffling is their complete lack of concern when the Rebels attack. This scene originally played as an example of Tarkin's hubris -- but factoring in the events of Rogue One, it feels like he's either willfully ignorant, or has been huffing some galactic paint thinner.
"Do I remember what happened last week? No, it felt like I was barely there."
And as for the Rebels? Galen Erso should be the hero of the Rebellion. They should want to erect statues of him in their hippie commune rainforest base -- instead he's never mentioned again. Same goes for the team of people who sacrificed their lives to steal the plans, who don't even get a quick shout-out because, according to these jackholes, the plans were simply provided by Princess Leia.