Isn't this something the compiler is going to enforce anyway? Why does it matter? If that's the only difference it's kind of inconsequential isn't it?

It's a question to filter out people who don't know a lick of Delphi for a position where the person was coding Delphi. It's like level 2 after the hello world chapter. It's easier than asking a database developer the difference between a query and a view. It's a bonehead simple question that 70% of applicants couldn't answer.

You would be surprised how many bad applicants interviewers get. It's only gotten worse over the last 20 years.