No redefinition information in the transcript file

Question

The fntguide says that:

\DeclareTextSymbol {⟨cmd⟩} {⟨encoding⟩} {⟨slot⟩}

This command defines a text symbol with slot ⟨slot⟩ in the encoding. For example, the definition of \ss in the OT1 encoding is: \DeclareTextSymbol{\ss}{OT1}{25}. It does not produce an error if the command has already been defined but logs the redefinition in the transcript file.

OK. Let me redefine the text symbol \ss as follows

\documentclass{article}
\DeclareTextSymbol{\ss}{OT1}{28} % 28 is the slot occupied by \o
\begin{document}
\ss\o
\end{document}

The output is as expected (double ø). But there is no redefinition information in the log file. Why?