Yes it is true, Bob, that if you want to use SketchUp, other than via the web, you need to run it through Windows.
From memory, when I was looking at it, the free web version is also pretty restricted as they want to direct you towards a paid version.
Also, from memory, so I could be wrong... I
think that you had to run the free non-web version to Windows 10 rather than Windows 7.
I seem to remember having to load Windows 10 into virtualbox & I am sure that it was only to do with playing with SketchUp.
To setup a Windows version in virtualbox is not something that requires great computer skill, just a few easy to follow screens to set it up (& a bit of understanding of what it is doing) & then just a couple of mouse clicks when you want it to run..
You do need a Windows disk, however..
To be honest I found setting up Windows in virtualbox easier than using Sketchpad - but I claim few design skills...
