Samuels inspired the Windies to a four-wicket win over Australia on Monday, making 92 as the hosts chased down the target of 266 with 26 balls to spare.
The win lifted West Indies into second in the table on eight points, one behind Australia (nine) and three clear of South Africa (five).
Australia great Shane Warne had slammed Samuels earlier this year before the latter responded with his heroics in his side's World Twenty20 final win over England.
Simmons said the 35-year-old had moved on from the feud and insists his performance against Australia was all the batsman needed.
"The fact that he's taken us to victory in the game, so to speak, would be enough for him," he told a news conference.
"I don't think he's still worried about what some people in Australia said.
"I think he answered that in the T20 World Cup final so I think he's left that. I think he's left that, I think he's just happy to score the runs and the team to win."
Johnson Charles (48) and Darren Bravo (39) provided plenty of support for Samuels in the Windies' much-needed victory at Warner Park.
Only four matches remain in the tri-series before the final, beginning with the hosts' clash against South Africa on Wednesday.
Simmons said his team would take plenty of confidence from their latest victory.
"The feeling has always been good. I think we realised that we didn't bat properly against them last time, so we had to bat properly this time," he said.
"In that way, we'd be happy with ourselves because the batting came to the party today and that's what's been lacking for us.
"It's a good feeling to know that you beat Australia, who are world champions and the number one team in the world. It means we are moving in the right direction."
Sunil Narine was unable to take a wicket in his side's most recent outing, but he has eight at an average of 13.37 in the tri-series.
A dramatic collapse cost South Africa last time out as they lost 42-7 to slump to a 36-run defeat to Australia on Saturday.
They have relied on Hashim Amla (115 runs at 38.33) and AB De Villiers (92 at 30.66) and will need a batting improvement to overcome the hosts.