Keogh RMD rule for working after age 70.5

I just read the rule where if you are a greater than 5% owner of a business and still working after age 70.5 you can defer your RMD distribution until the April after you retire. Does that mean if I still contribute to the Keogh each year I'm "not retired." I own the business outright -- it's an LLC registered in MD and I contribute each year the maximum amount to the Keogh. If not what does the word "retire" mean in this rule.

Thanks, gjw