I don't recall that at all. There was never any direct statement by Apple, just rumor sites reporting that an anonymous Apple employee said so. Which doesn't mean a thing, because guess what, rumor sites don't care very much about vetting stories.
The other thing is, even if that anonymous tipster actually existed and was accurately quoted, we know they were wrong! I tested M1 SSD behavior myself and found that Apple's NVMe SMART implementation reports host bytes written exactly according to NVMe spec. IMO, the whole idea of a reporting bug was just nonsense made up and circulated by fanboys on forums until it jumped over into rumor "reporting" and thence into your brain, where it lodged itself as if it was a fact, even though it was not.
The main cause of excess writes was an overeager swapout algorithm in the XNU kernel:
Some of Hector's other tweet threads talked about it affecting Intel Macs too, because XNU's VM code is not fundamentally different between Apple Silicon and x86. (The very lowest level details of how to manipulate page tables are different, of course, but policy decisions like how much memory pressure is enough to start swapping things out, and selection of what gets swapped out? That stuff's generic crossplatform code, as I understand it.)
However, as this bug was introduced with Big Sur, and Big Sur launched alongside M1, people's attention was on M1 and suspicion fell on the hardware even though it was really the OS.