It’s right in the article, the OEM (Original Equipment Manufacturer) meaning a company like HP or Dell was involved.
They typically only shipped Windows on their devices and Linux probably wasn’t on their radar as it was such a tiny percentage of users and didn’t bring in money.
01189998819991197253@infosec.pub 5 days ago
I’m wondering if, like you postulated, they just didn’t add Linux into their radar for the data collection at that time, so they just had no data. So, while they only had data on windows, all OSs on that hardware configuration would have been affected, since it was a hardware bug and not a software bug.