Comma before "or" or no?

"Every student can learn, just not on the same day or the same way." – George Evans

From old technology – i.e., a source reference book – it should read "Every student can learn, just not on the same day or the same way." - George Evans

This is correct as 'not applies to both parts of the conjunction.

However, I see that there are many, many examples picked up by a search have added the comma after day. Who do you trust?

You need to cite the source that you are using and follow its punctuation.

The coma belongs because a list is being used. I have no idea what the phrase not covers both sides of the conjunctionn means. How is that even relevant? Can you deny that a list is being used? For instance, I use commas after dependant clauses, explanatory remarks, or other cases where they are needed. That too Indicates a list of three or more items and a comma is needed.