WARNING: The following contains spoilers for Nightwing #83, on sale now from DC.
Nightwing #83 concluded Tom Taylor and Bruno Redondo's first story arc "Leaping Into The Light" with a big reminder of who Dick Grayson is as a superhero. In many ways, "Leaping Into The Light" is a love letter to Dick's entire history that calls back to his early days as Robin in the 1940s and especially his decision to become Nightwing in the 1980s. Related to that is the role Superman played in shaping Dick's current identity, which is acknowledged in the story arc's conclusion.
Superman being associated with the Nightwing identity is not a new concept. In fact, the name first appeared in the Superman #158 story "Superman in Kandor" first published in 1963. In the story, Superman and Jimmy Olsen encountered Kandorian raiders on Earth, prompting them back to the Fortress of Solitude where the Bottled City of Kandor was being kept. Since Superman couldn't use his powers in Kandor, he took inspiration from his old friends Batman and Robin to take up new identities in the city while investigating their latest threat. It was established that Nightwing and Flamebird are native birds to Krypton, which Superman and Jimmy Olsen used as their Batman and Robin analogue names. This story would be referenced again in The New Teen Titans run by Marv Wolfman and George Pérez.
During "The Judas Contract" story arc of The New Teen Titans, Dick Grayson found himself at a crossroads in his life. He was quickly approaching adulthood, and throughout his adolescence, he fought threats alongside a team of other sidekicks like himself called the Teen Titans. Realizing he had outgrown his role as a sidekick to his mentor, Batman, Dick no longer felt Robin was the right identity for him. He then spent a considerable amount of time thinking about where he wanted to be in life and whether or not being a superhero would fit into that new life. It's not until Deathstroke makes his surprise attack on the Teen Titans that Dick starts to put more thought into his new superhero identity, which leads to a pivotal moment in The New Teen Titans #44.
In that pivotal moment in issue #44, Dick thinks about what his entire journey comprised of from childhood to adolescence. He especially thought about the important people in his life who helped shape him into the person he had become. Two of those people were his parents, John and Mary Grayson, who taught him his acrobatic skills. He also named Batman for taking him in as a scared little boy and taught him to become a good young man. He also credited Princess Koriand'r (Kory) for staying by his side, even when he made bad decisions that nearly hurt his other relationships. The last person Dick named as an important influence in his life is also the superhero he got his Nightwing identity from: Superman.
In his own words, Superman taught Dick the meaning of "honor, selflessness, and the true meaning of the word 'hero'." This detail is further elaborated upon in the 1999 story "Taking Wing" featured in Nightwing: Secret Files & Origins by Chuck Dixon and Scott McDaniel. In the story, Dick recalls a conversation he had with Superman in a time when Batman had essentially "fired" him from his role as Robin and didn't know what to do with his life moving forward. He turned to Superman for guidance, who then told him about a Kryptonian legend that reminded him of his unique situation. In the legend, a young man had also been kicked out by his family and dreamt of helping the weak and used his talents to seek justice for those who couldn't seek it themselves. That man became known as Nightwing on Krypton, which in turn, inspired Dick's new identity and purpose.
The entire storyline for "Leaping Into The Light" has been about re-establishing this status quo for Dick Grayson. It only made sense that it would conclude with an affirmation of the original message behind his Nightwing identity. It certainly couldn't end without reminding the audience of one of the superheroes who helped him get to where he is now.