If I caught that correctly, this ”Sam Spade” character referred to the Taco Bell incident occurring ”the day before [Eric’s] death”. Assuming this is true, it would imply that the poster knew the exact day that Eric died, when even the authorities appear to have no such knowledge (due to uncertainty resulting from the state of decomposition). While the poster’s truthfulness in general is questionable, this embedded implication about their knowledge could be a Freudian slip.

Henry Lee Lucas of course had Ottis Toole as his accomplice, and the picture of super-prolific sexual predators that the two painted of themselves with their confessions sort of matches how the perpetrator(s) of this case come across. But I’d imagine (or at least hope) that officials would have tested Lucas’ DNA as well, unless they had already ruled him out via other means.