That's so weird, if you modified the permissions, Apache should have access now, did you get any error when running the commands? If you didn't stop that instance yet, can you run the Bitnami support tool again?
How to Run the Bitnami Support Tool
Please note that you need to paste the code outputted by the tool in your reply.
If you make changes in that file, the permissions shouldn't be overwritten. I don't know why they were modified but you shouldn't run into this issue if you use a new instance or if you recover the permissions in the current instance by following the instructions in the video.