Tempers flared after the final whistle when Nahuel Molina struck Rodri, prompting the Manchester City midfielder to confront him and spark a wider melee involving players from both squads.
Amid the chaos, Ayala approached Eric García and Olmo and struck the Barcelona forward, who had been calmly watching the situation unfold. Ayala later apologised for the incident, describing it as "more of a push than a punch" and saying it had been "a reaction to some words."
Olmo, speaking to Diari de Terrassa, dismissed that account entirely.
"Someone who says they're sorry but justifies a punch by saying it was a response to a comment is surely not sorry," he said. "He is lying, because I didn't say anything to him, so he doesn't need to apologise to me. What truly defines us is not the mistake, but the courage to acknowledge it."
The Barcelona player chose to move the conversation away from the incident itself, instead stressing the example he and his Spain team-mates wanted to set.
"I want them to be proud of how we competed, how we won, and above all, of our behaviour," he said. "Football's significance means players are an example for children and new generations, and that carries great responsibility."
Olmo also reflected on what he saw as the defining feature of Spain's triumph, pointing to collective effort over individual brilliance.
"The group, the collective, always above individual talents," he said, describing the squad as a close-knit family built on shared sacrifice.
He credited the coaching and support staff for the physical foundation behind the win: "Hard work, there's no other way, working hard to achieve the goal."
He added that the effort extended well beyond the training pitch: "And within that work it's not just the physical side, the invisible training is decisive: nutrition, rest, recovery, mental preparation, game analysis, healthy habits."
The comments cap a difficult few days for Argentina in the aftermath of the final, with the post-match scenes having overshadowed what was otherwise a widely praised tournament for Lionel Scaloni's side, who fell agonisingly short of a second successive world title against a dominant Spain performance.
Ayala, part of Scaloni's coaching staff, had earlier accepted responsibility for his reaction while stopping short of fully condemning it, insisting he had let his emotions get the better of him in the heat of the moment and expressing a wish to apologise to Olmo in person.
Footage of the incident, showing Ayala forcefully raising his hands towards Olmo's neck, circulated widely in the days following the final and drew criticism from pundits and supporters on both sides for the example it set at the culmination of the tournament.
Olmo's response, delivered calmly but firmly to his local newspaper, has ensured the episode remains a live talking point even as Spain's players return to their clubs to prepare for the new club season.