The key statement in the code here is that Windows 10 will perform BSOD through the current layout as early as possible during the boot process. The early version of this description is "We have encountered an operating system that cannot be started, but some methods have been developed. Between these two wordings, it is clear that at least one Google employee has been working hard to ensure that the device will boot properly on Windows 10.
Of course, the description of the submission does not necessarily mean that the Google Pixel Slate will be implemented with a dual-boot feature. But it does mean that at least some Chromebooks are expected to support Windows 10, and Google Pixel Slate may be there.
Being able to install Windows 10 will make Pixel Slate a more attractive product and make it more directly with MicrosoftSurfaceCompetition, considering that Chrome OS has just added Linux application support for its already thriving Android app experience, the Pixel Slate will be more usable than Surface for many technicians.