Some lees (trub) don't taste all that bad with a lengthy contact, and some may be good (like you've found). That doesn't mean it's autolyzing yeast though.
There are some yeast strains that are particularly suited for aging sur lie (on the lees), but those wines are stirred to keep the yeast from rotting during the aging. Some strains are extremely unpleasant in the same conditions, though.
Autolysis has a fecal rotten smell and taste when really present. I doubt it would be enjoyable! In a smaller amount, when it's just starting, it's a yeast "bite" (fairly 'meaty' like hot dogs) that is not pleasant either but not as bad as sulfury manure.