This combination would prevent anti-ballistic missile radar (BMEWS), presently the U.S.’s main screen against surprise attack, from ascertaining the point of impact until the rocket “deboosts”-about three minutes and 500 miles from target.
Source: wiktionary
In one tweet Elon appears to allude to the fact that Twitter’s internal systems can apply a shadow ban and deboost an account on their own, without any human interference or knowledge. […] Outside of the Twitter Terms of Service there are no guidelines for when or how a user could be shadow banned or deboosted – likely, because until recently most users were unaware that such a thing could occur to them.
Source: wiktionary
And it was not as though they were unable, as the waves of bannings and algorithmic deboosting of those on the online right began in earnest after 2016.
Source: wiktionary