This is to be expected. It was surmised from the timing of the Barr letter(s), that their main purpose was to take over the news cycle and give Trump his victory lap.
Time Magazine:
In his new letter, Barr chastises those “mischaracterizing” his previous letter. “My March 24 letter was not, and did not purport to be, an exhaustive recounting of the Special Counsel’s investigation or report… I do not believe it would be in the public’s interest for me to attempt to summarize the full report or to release it in serial or piecemeal fashion,” he wrote. Barr says he anticipates being able to release a redacted version of Mueller’s full report by mid-April.
It’s already starting. Trump is at his rallies, attacking the press, but it looks like the narrative is going to turn around fast. Yea!