The You Tube clip is a 6min cutdown of a 45min featurette (one of many) from the recent Battle of the Five Armies Extended Cut DVD, entitled The Gathering Clouds [sic]. Somebody has decided to create this cutdown using only the sections of The Gathering Clouds that discuss the difficulties faced, not the positive ways they were addressed and overcome which are also covered in this and other featurettes.
Peter has never made a secret of the fact that he took over the Hobbit directing job with very little preparation time remaining before shooting had to begin. It was a challenge he willingly took on. His comments are an honest reflection of his own personal feelings at times during the movies production.
However they are not a reflection of either the actual production of these 3 movies which was very tight, professional, happy, and finished on schedule and budget nor do they reflect the finished result. Peter is very proud of the 3 Hobbit movies, and actually regards this period as one of his happiest film making experiences something he has said publicly many times.
Shifting 2 months of shooting from 2012 into 2013 to allow the long and very complex battle sequence to be properly planned and shot, had no impact on the budget or release date. It is exactly what any responsible director should do, given the compressed pre-production time Peter had for these 3 technically difficult movies.
Ever since The Frighteners, Peter has tried to provide fans with honest, detailed, warts and all behind the scenes featurettes compared to the usual bland Hollywood publicity material seen on most other DVDs. Its a little sad to see desperate media outlets hijack this honesty to feed their ravenous appetite for negative sensationalism.