The title of the video wasn't "How to make ink," it was "How ink is made." Those are similar, but fundamentally different ideas. With the former you expect to

The title of the video wasn't "How to make ink," it was "How ink is made." Those are similar, but fundamentally different ideas. With the former you expect to come out the the process knowing how to make ink. The later is a bit more vague. To me anyway, it doesn't imply any specific level of detail with which the process will be described, and it's a perfectly appropriate title for something that explains the process in very broad steps.