In the interests of discussion...
I read the article and it doesn't seem that unreasonable that they pulled the documentary while they investigate the production company.
For example, if I was watching a documentary on Gaza and there was some close connection to the IDF and the production company, I would probably want that investigated too, as the documentary could be misrepresentative.
I hope that the BBC investigates and that the documentary is found to be accurate or as unbiased as possible, or whatever criteria they are looking to satisfy.
The more documentaries exposing the suffering in Gaza the better!