Tarantino’s homage uses that title like so many spaghetti spinoffs did - as in any western anti-hero movie can be a “Django” movie! He did a similar thing with “Inglorious Basterds” and has said in interviews that in his youth he used to just call team-up adventure movies “Inglorious Bastard” films, inspired by his love of the original.
I thought the Franco Nero cameo was fun and the dialogue gave Nero a nice clever line to punctuate the moment.
“What’s Your Name?”
“Django.”
“Can you spell it?”
“D-j-a-n-g-o. The D is silent.”
“I know.”