Yes, this is true. However, they claim that they have limited success currently.
It also won't be a Flatpak for those that prefer the clean option for software use. AT least I can't see it being able to do that as it requires too much low level access. Snap maybe, not Flatpak
Regardless, it is a good solution for those non GPU programs that people need that might be holding them back from converting. Office, for example. Sure, there is some success with Wine and other options, but this is much more solid and reliable as it uses the actual windows programming. DLL etc.
There is one more issues that you didn't mention, but I want to point out. It is WINDOWS in Linux. This can mean that there is a very real possibility of security issues. Not as serious as a traditional Windows install, but still those components can allow access. That combined with access to your files etc. can be a security issue IMO.
Another issue is man-hours are being taken away from developing the programs that translate the Windows in real time. Tools like Proton and Wine to wedge a full Windows OS into Linux. This option bloats your install, where translation programs are more effective and provide less bloat. (not to mention more secure)
Still it is an interesting option. A option I believe people did years ago by taking various components of Windows in an attempt to make it more compatible. Before Wine and other tools were developed to replace those DLLs etc.