What pandemic, Hal?

I've been reading Trish MacGregor's novel White Crows. Hal is a person from the distant future who has time-traveled back to c. 2022.

Sometimes, when they'd been preparing for this trip, they'd gotten -- or remembered -- data that had contradicted what they currently had known about the twenty-first [century]. He remembered, for instance, that when he was in his teens, his mother had told him that once they were ready to leave . . . they would have to choose a year other than the early 2020s because a pandemic would be raging. But no one had mentioned pandemic in subsequent years and clearly, no pandemic raged now.

Not long before his mother was killed . . . he'd asked her about that pandemic in the early 2020s. She'd looked at him, frowning. What pandemic, Hal?

I thought this was incredibly witty and was a bit disappointed when the novel went on to offer explanations in terms of alternate timelines and the Mandela Effect -- because it's such an accurate portrayal, only slightly exaggerated, of our current reality, without any need for sci-fi shenanigans.