The article is a bit rambling but my summary of the story is:
This website has previously majored on raising doubt that the FISA surveillance was done under a warrant;
The DoJ during Obama (continued) to exclude a sensitive section of the DoJ from OIG oversight;
This section and the FBI were undertaking FISA investigations without warrants;
The National Security Agency became aware of this and put a stop to the practise;
This happened during the time that the Trump surveillance took place;
DoJ and FBI were using contractors for this work. as per the document you extracted above;
The Last Refuge had a "tip off" that Fusion GPS were used by the FBI as contractors (as previous highly unlikely to be mentioned in the redacted document used to support the argument).
ergo Steele and Fusion GPS were in cohoots with elements of the DoJ and the FBI to conduct a rogue investigation into Trump bypassing court protocols to carry this out.
Like you say it's a no from me but it would be good to understand what is so compelling about this to make it a yes from you?