My assessment of the facts.
Look who made the announcement: US Attorney David Freed, nominated by Trump and under the direction of Barr.
Look at the information in the announcement: it was incomplete and, in contrast with past practices, included information about who the votes were for.
Look at the timing of the announcement: again, announced publicly before the investigation has concluded and at a time that underscores POTUS’s current campaign message.
Trump’s current campaign theme is that he could only lose if the election is rigged. He knows he is going to lose so he is trying to create a climate of chaos so that people don’t trust the result and he can hopefully use the DOJ and courts he has made more favorable to him to intervene and give him a better shot.
This benefits him but hurts the US.