What's there to explain, you didn't say anything.
Sorry, but unless you're going to elaborate it's not much deeper than saying sometimes all skies are blue. I mean, yeah all QBs get pressured and at times their O line breaks down but that doesn't mean it's not a factor in why the offense took a dip last season.
In the video provided (which JUST 10 plays out of the dozens) nearly every play Dak was getting significant pressure. You can use a blanket statement if you want, but that led to much of his struggles and it snowballed once defenses were able to expose the issues.