I know what you were referring to. It has already been hyperlinked; I had already referred to where M. Cantrill explained that he gave up; and as I have just explained, the people who wrote GNU tail gave up in the same way (for much the same reasons, I expect) and GNU tail does not handle truncation any more properly than M. Cantrill did. There's no doco, but there's commentary in the code observing the problem.

And as I then went on to explain, this whole idea of truncating one log file over and over is a poor one, and not the best way to do logging in the first place. So the fact that both M. Cantrill and the GNU people gave up should perhaps be viewed as stopping when an inferior mechanism is pushed beyond its limits.