It's really not hard to find the original statement from Microsoft, which was made by a Microsoft employee.

At the 2015 Ignite conference, Microsoft employee Jerry Nixon stated that Windows 10 would be the "last version of Windows", a statement reflecting the company's intent to apply the software as a service business model to Windows, with new versions and updates to be released over an indefinite period.[68][69][70] In 2021, however, Microsoft announced that Windows 10 would be succeeded on compatible hardware by Windows 11—and that Windows 10 support will end on October 14, 2025, marking a departure from what had been dubbed "Windows as a service".[71][72]