It was in reference to the Gwen Mexico cover you exercepted. To quote myself fully, with proper context.
The Mexican Gwen Stacy thing i.e. they published issues where they were married were dream sequences for the Mexican market to pad the issues out.
Which was quite obviously a post-issue CYA comment given by the editor, in this case, Roy Thomas, to the reader to defend the story in the wake of a public outcry (including letters calling for Conway's death openly printed on the letters' pages).
Gerry Conway who was the writer on ASM said that if there was no plans to kill Gwen, he'd simply break Peter and Gwen up anyway.