I find it difficult to accept the "explanation" that they had to release their statement about stepping down because they knew their plans had been leaked. Even if the story had been published how would the public know it was real? They came out with a statement disavowing the bullying story. There are stories non stop about supposed royal protocol "rules", and how Kate and Megan are either forced to toe the line or are breaking the rules, rebelling, etc. There are stories about abdications, tiaras, who stands where/rides where, is invited to this or that and who's upset or angry about this or that. Why would a leak about them stepping down or stepping back and moving require immediate response?
Personally I wouldn't be one bit surprised if Harry has extreme oversensitivity and a short fuse regarding anything that reminds him at all of what it was like when all of the attention was getting to his mother and the unbelievable horror of the white hot spotlight when she died. It's not that he's inventing issues out of thin air, but he quite possibly is incapable of taking a measured approach and being able to cope when it comes to his wife and child. Megan might find the same stories frustrating, maddening, humiliating, inhumane, etc., but she may well be able to shrug it off more easily than Harry. It's entirely possible she's unable to rein in his reactions -- but of course she's going to be labeled the culprit and mastermind, further validating Harry's viewpoint in his own mind.
I also wouldn't underestimate the staff or courtiers or whatever the correct term is. If they've got a bias against Megan it's relatively easy for them to use all of their power against her and undo most of the efforts the family might be making to help and be supportive. When you factor in the strange and detached environment that the generations before Harry and William have grown up in and consider normal it may well be that the family to a large extent has a great deal of difficulty understanding what is so hard about the situation for Harry and Megan.