Yes that is the advice but it is ambiguous and vague - deliberately I guess.
It is not that difficult. As far as hill walking is concerned, if you have hills near-by, you can go hill walking. Driving a few miles to get to the start of your walk is fine.
For me Arrochar, for example is out, it is about a 50-mile drive from where I live. The nominal figure is 5 miles, I don’t think I can argue that 50 miles is within the guidelines. So, for now, no Munros, Corbetts, Grahams or Donalds for me.
The mountain rescue advice echoes the governments advice.
I guess cabin fever is setting in for many, and yeah not being able to travel to the hills is extremely frustrating, but this is not forever, and as we have seen collective action is essential in combating Covid19.
We just need to be patient. The hills ain’t going anywhere.