Hinduism (and so Bhagavad Gita) allows people to choose a path, which is best suited to their inclination. There are many predefined paths like Bhakti, Jnana, Dhyan, Karma to choose from. Additionally, there are many subpaths, for example, Bhakti can be further qualified as Bhakti to a particular God, like Krishna, Shiva, Shakti etc. All these paths are considered equal, reaching to the same destination.

In case of ISKCON, their organization is heavily inclined to Bhakti Marg, and more particularly Bhakti of Krishna. In this context, they see ‘Krishna Bhakti’ everywhere, in every Shloka of Bhagavad Gita. Even a karma/dhyan/Jnana related shloka in Gita is also seen through angle of Bhakti of Krishna.

Bhaktivedanta Swami Prabhupada, was a great devotee of Krishna, who achieved highest state of Krishna Bhakti, and through his eyes, the Bhagavad Gita he wrote is as real as it gets.

Are they wrong or fabricating something? Absolutely NOT. This is what is expected from a true devotee Krishna. I would have surprised if that wasn’t the case.

Additionally, ISKCON’s Bhagavad Gita is the right one for you, if you are also inclined to follow Bhakti Marg, and more specifically Bhakti of Krishna.

But, if you are inclined to other paths of Hinduism, you might find their interpretation non-convincing.

Only objection I have for ISKCON’s Bhagavad Gita is the ‘name’. My humble request for anyone from ISKCON reading this answer is to slightly update it to say ‘Bhagavad Gita – As it is, for Bhakti Margi” or something like that, it would be really great, and also will reduce any confusion and misunderstanding people have about ISKCON.