Starc on Tuesday became the first member of Australia's bowling cartel to speak since Khawaja's bombshell revelations once again shook cricket.
The left-armer remained adamant he did not know about the use of sandpaper prior to Cameron Bancroft being caught by camera operators in Cape Town.
Starc also insisted he was unaware it had been used in the previous Test in the 2018 series, after Khawaja revealed the plan was hatched and rolled out at St George's Park.
Australia's bowlers released a statement in 2021 declaring they did not know of the ball-tampering plot, a point Starc reiterated on Tuesday.
"We weren't aware anything was taken onto the field to be tampered with," Starc told a heaving press pack at Kayo Cricket's launch event.
"We saw (the sandpaper) on the big screen in Cape Town.
"As far as the book is concerned, I haven't read it. I probably won't read it. So that's for Usman to elaborate on."
Starc's comments came after Cricket Australia (CA) chief executive Todd Greenberg ruled out reopening the investigation into the matter on Tuesday morning.
CA's investigation found only Bancroft, captain Steve Smith and vice-captain David Warner were aware of the plan.
Warner has since posted on Instagram that Khawaja's claims were "100 per cent accurate", labelling CA's investigation as "rushed and botched".
Asked why he and Khawaja had such differing views, Starc responded: "That's a question for him.
"I'll stick to what I said five years ago, what I said at the time, eight years ago.
"Clearly, there's different versions from different people, and I'll leave it where I left it back then."
Starc said he had not spoken to Khawaja "in the last day or two", after the sensational excerpts from his autobiography, released on Tuesday, were published on the weekend.
Asked whether he thought he would speak to Khawaja in the future, Starc replied: "It's up to him".
The ball-tampering topic dominated Kayo's launch event on Tuesday afternoon, and threatens to have the same impact on the start of the men's summer.
Mitch Marsh is due to speak before the first ODI against England later in the week, and will no doubt be asked about it.
Nic Maddinson, Marnus Labuschagne and Scott Boland have also faced similar questions in recent days.
"It's definitely disappointing that that's what we're talking about heading into what's already kicked off as a really exciting summer," Starc said.
"Probably different people felt different ways about it at the time and certainly through the last eight years.
"Not only certain players, but certainly the staff and whoever was involved in it.
"Boof (Darren Lehmann, the coach at the time) for one has obviously spoken a bit as well. He's not to be forgotten in all that as well.
"As far as I think Trav (Head) said it best the other day, the group has changed a lot. We certainly look forward to what's coming up more so than what's gone."
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