Don't get carried away.
The AAIB are almost certainly the best in the World at what they do. Their integrity is utterly beyond reproach. Their aim is never 'blame'! They simply seek to understand why and how accidents happen, so that we are all safer in what we do.
This interim report is merely a statement of very limited facts, as they are currently understood, and we have to read the report extremely carefully, because every single word will be well chosen, and accurate.
They have said the a/c 'appeared' to be responding normally to control inputs. They have not (yet) said the a/c was fully serviceable. They have not (yet) commented on the physical well being of the pilot, during this manoeuvre. etc.
As we have heard earlier here. Just because the a/c's second pass was (estimated?) at 200' that does not simply mean the aerobatic manoeuvre necessarily commenced from this (approximate) height. One would need to fully understand the nature of aerobatic routines to make that call.
This information is exactly what it says 'on the tin'; a preliminary report. There is still a very long way to go. Much not yet known. Much to be double and triple checked. We may learn more by about this time next year.
Until then, there will still be those happy to speculate on the basis of one or two snippets of information.
As has occurred in the past, they may be proved wrong!