It may be splitting hairs, but why would Cruz report the loan on his Senate report and somehow forget to file the information on his FEC report? Could be a paperwork error, but it sounds awfully convenient.
Not reading too much into it, but it is just another “oops” from the Cruz campaign.
I don’t know the answer to that, but given that it was publicly available in one form makes it hard to believe that they were trying to conceal it. It wouldn’t take much sleuthing to find the filing in the Senate side of it.