True, but not the point. The point is that there were heaps of contact, including the email setting up the meeting in Trump tower where they state they're out to help. Don Jr was giddy accepted negative info about Hilary from the Russians. And at no time did the Trump campaign report these contacts, and once they were discovered, they all initially lied about them until emails and videos etc started to show up.
Mueller also was frustrated due to the use of encrypted technologies thus could not detect anything more than he concluded. Its in his report.