Mostly true for many engines SSD, but not all.
Many wet-sump engines will splash oil into the bores and onto the crankshaft when turned, all 2-strokes will bring oil-fuel mix throughout the engine when turned, leaving the oil behind as the fuel vapourises.
As to whether localised "dry spots" in a dry-sump engine will be lubricated with turning the engine over - goodness knows, but I doubt that it'll make things any worse.
DFC - whilst I have written several write flight manuals, so am duty-bound to defend them in most contexts, it's worth remembering that the manual was probably written when there were only a couple of aeroplanes of the type in existence with a few hundred hours on them. Many types have accumulated hundreds of thousands of hours since then and probably the only lessons passed into the manual as later amendments were pure safety ones. I wouldn't do anything that the flight manual specifically prohibits, but many sound practices may never find their way in there and, with caution, you can learn good techniques elsewhere. To put it another way, how much useful information will you actually find at-all in the POH of a Piper Cub?
G