http://www.merriam-webster.com/dictionary/homage
homage
noun hom·age \ˈä-mij, ˈhä-\
- : respect or honor
- : something that is done to honor someone or something
To me, homage would have meant Snyder and Gadot doing or re-enacting something directly attributed to Lynda Carter's portrayal of the character. For instance, the twirl Carter did changing from civilian clothes to her uniform. Or the sound effects that accompanied the use of her powers. Or a line or phrase which Carter used during her series. Lynda Carter doing a brief cameo would have been a transparent homage.
If I understand correctly, Gadot playing the role that Carter previously played honors Carter by default. If so, every actor or actress playing a role previously played by someone else indirectly honors the former performer. Ben Affleck paid homage to Christian Bale. Christain Bale paid homage to George Clooney. George Clooney paid homage to Val Kilmer. Val Kilmer paid homage to Michael Keaton. Michael Keaton paid homage to Adam West. Cross-references nets Affleck to Keaton or Bale to Kilmer or Clooney to West. Lots and lots of combo homages.
Dang it. Why did I mention Adam West? Now I got that stupid
Batman theme bouncing around in my skull...