While claiming Walker would remain with the Roosters next season, Robinson on Friday night said the club and hard-nosed chairman Nick Politis were certain to then move the 24-year-old on.
"Nick was pretty clear. We were pretty clear in those negotiations. We knew what we wanted and, no, that's it. It's done there," the Roosters coach told Channel Seven during World Cup commentary.
"Sam's moved on and we've moved on, so there's no way to get a deal done after this."
The Roosters dramatically pulled a contract offer, reportedly worth $1.1 million a season, for Walker to remain at Bondi Junction until at least 2030.
It is understood the Queensland State of Origin playmaker and new Kangaroos debutant was seeking another $200,000 a season.
But, as in negotiations with Latrell Mitchell six years ago, billionaire Politis would not budge.
"No one's done anything wrong. No one's a bad person in this," Robinson said.
"He didn't want to sign. We wanted to sign him for an amount and we couldn't get it done."
The four-time premiership-winning coach maintained Walker had ample time to consider his options.
"Don't forget we started middle of the year in negotiations," Robinson said.
"They pushed it back to after the season, and (now) we're after the season and November 1's coming, and Sam was our biggest contract.
"So therefore a lot of dominoes have to fall after that and other players need to know as well.
"So it was pretty clear in the timeline that we gave him and, I've said before, these deals aren't difficult.
"We're not talking about is this the right club? Am I going to develop in this club as a young player? It's do I want to be here, and is the money right?
"And we couldn't get it done."
Despite declaring the end, Robinson said he was disappointed Walker had been criticised this week.
"We wanted to sign Sam and then we couldn't get it done and that's the business side of it," he said.
"Then from Tuesday onwards it's been a bit frustrating around the commentary around Sam and the way his character is and what he should have done.
"No one's on a lifelong contract. He's signed until the end of next year. He's a great guy. He's really personable. Everyone loves him and he just didn't want to sign for 2028.
"So it's pretty simple, and we've moved on. That's the business part, but I didn't really like the character assessment of everybody during the week. The commentary around all of that was just a bit too much for me."
Regardless of whether or not Walker is truly part of the Roosters' plans for next season, he will be among the hottest free agents when the NRL trade period opens on Sunday.
But not quite as hot as Penrith superstar Nathan Cleary.
With North Queensland and Walker's Maroons and Kangaroos teammate Tom Deardon on Friday saying there was "zero chance" of a swap deal, the Roosters are seemingly set to show faith in young gun Toby Rodwell to partner Hugo Savala in the halves after Walker's eventual exit.
That is, unless the Tricolours make an audacious bid for Cleary, who has yet to commit to Penrith beyond 2027, when his father Ivan is due to finish up.
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