Thank you so much for the help and feedback, I'm admittedly still getting the hang of licensing side of all this and some of it still feels pretty confusing. I deleted that line from the text and I think I added the metadata correctly.
1.It seems yes. But before changes IIRC you pointed it is CC-BY-SA but now it is CC-BY is it correctly?
2. If you want to know more about CC licenses, read it https://creativecommons.org/about/cclicenses/ and links at the right bar on that site
3. If you think that it was useful for you, you can leave a comment here to support my proposal about making metadata more visible for those who are interested in it https://itch.io/t/2919128/metadata-encouragement#post-7952450