One problem with these general aviation rags is that to fill the pages they print a lot of stuff which may apply to some type which was built in 1922, and another one last built in 1947, but the advice might be completely wrong for something else. Some of the stuff I've seen in these CAA-sponsored publications is pretty amazing.
Lycoming for example (can't find an online reference right now but have read it enough times) recommend against ground running because the engine doesn't get hot enough to burn off the moisture in the oil. And if not run for several months, they suggest doing specific things to preserve the engine.
I suppose one could ground run at a fair RPM for quite a while. But why not just fly it? The pilot needs the currency too, probably rather more than the plane. There are plenty of perfectly flyable days in the winter - just not at weekends
