First, Lisp has had macros since the 60s. To quote Gabriel and Steele:

“Macros appear to have been introduced into Lisp by Timothy P. Hart in 1963″

Second, 1986 was when Scheme developed better macros than Lisp, not when Scheme developed macros.

I can’t speak for Sam. I don’t know CL or its history.

Maybe he means hygienic macros?

First, quoting Gabriel and Steele, “The simple but powerful macro facility on which DEFMACRO is based was introduced in MacLisp in the mid-1960’s.”

Second, 1986 was not the year that the first macros were written in Scheme – it was when the papers “Macro by Example” and “Hygenic Macro Expansion” were published. Prior to that, Scheme had macros, but not better macros than the rest of Lisp.