Windows Terminal is a separate project from PowerShell. It's just a terminal that you can use with different shells (including PowerShell).
I have no idea what their blog posts are saying, but at least I've always found it pretty nice.
PS has been pretty slow though. I’ve liked the fact that you can pipe objects, but it seems to slow down the startup time of the shell.
True, the slow startup is annoying (especially if you load modules in your profile), but overall I still think it's better than the alternatives. I usually just keep a terminal window always open.
PowerShell is available for Linux if you want to use it more without Windows.