One of the overriding purposes behind a coronial inquest (in a situation where there is no chance of criminal proceedings), is to simply look at the incident and to ascertain whether anything may be implemented in order to prevent reoccurrence.
As mentioned in Andy's post, the coroner, I imagine, will be focussed mainly on this particular incident unless there was something link to other incidents with an apparent similarity in their likely cause. In honesty, if an investigator does their job properly and does know of the youtube footage, they would include it for the coroner's info.
As you can guess, the investigation is likely to look at the aircraft, the operator and operating environment and the videos do fall under the second category obviously.
The bonus is this - a coroner (normally....) doesn't just listen to a one sided or ill reported newspaper article for their facts, they take them from a variety of relevant and reliable sources, anything that might help in fact, gather all the info and look at the overall picture and go from there.
I certainly know only the smallest fraction of the facts in this case, but if one of the scenarios in my mind holds true, then I would like to think that this incident does not necessarily hold catastrophic consequences that some may fear.
Again, I DO NOT know all of the facts.