Martin (1992: 521):
Reconstructions of unshared experience can be further divided into vicarous [sic] (e.g. gossip) and personal (e.g. anecdote) experience.
The claim here is that types of previous experience of the speaker and listener is a distinction of mode. This is inconsistent with the notion of mode as the part played by language in cultural contexts.
Registerial reconstructions of unshared experience are the construals of experience as meaning. The confusion is thus along three theoretical dimensions simultaneously: stratification (context vs semantics), metafunction (textual vs ideational) and instantiation (potential vs instance type).