This was being proposed by Barr and co a few months ago, the current Twitter debacle (A tweetacle? Tweetgate?) just happens to be an excellent case to push it forward with support.

Before that it was proposed repeatedly by several Democrats, especially during the Birther nonsense.

I think you are assuming that the order is a cause rather a convenient excuse to pursue a specific agenda. I appreciate the approach, by a person signing it is just a convenient lightning rod. Note that it seems to be working very well.

The DOJ report that was just released was the result of a year-long investigation by the anti-trust division of the DOJ. While it's release my have been accelerated by Trump's executive order, it certainly wasn't caused by Twitters recent fact checking, and it doesn't directly address some of the points in the executive order. Rather it focuses more on "big sites aren't doing enough to combat crime" than "conservative voices are being suppressed".