Wow, that is an excellent article. WHO is that author?! I want his autograph.
While I am inclined to agree with this author (about almost anything), I must confess I haven't given this matter much research or thought in the past, so I shouldn't comment at this time, but of course I will, though briefly and not in much detail.
I haven't looked at the two "confessions" in awhile, and without looking at them right now, because I'm tired, I will say that it is my understanding that both the 1:45 and the 5:45 statements initially were used by Claudia Matteini and everybody else to reach their conclusions about Amanda and Patrick. In that sense, the 5:45 statement did not supersede the 1:45 statement, nor did it make it disappear.
For example, if Claudia wasn't looking at the 1:45 statement, then why would she state that Amanda had claimed that Patrick had told her the bar would "remain closed" that evening? I think that's the only place that claim appears. According to everything Amanda said OTHER than the 1:45 statement, Patrick didn't tell her the bar would be closed, he just told her it was slow and not to come in. And in fact, he did not close the bar, at least not until 10:00 p.m.
When the cops wrote Amanda's 1:45 statement for her, they stuck the part in there about the bar being closed because they were trying to set up the meeting between Amanda and Patrick. When Claudia talks about the discrepancy between what Amanda said and what Patrick said, she is actually talking about the discrepancy between what the 1:45 statement said and what Patrick said.
I can see why the police would have wanted to delete the message, and they very well may have, in order to make it look like Patrick closed the bar so he could go out and commit murder. But at some point, the cops' and Claudia's approaches seem to have diverged.
As I said, I'm tired, but to me, Claudia seems to be admitting that indeed the bar was open that night. She lends so much more weight to Patrick's claims than to Amanda's that it appears to be much more important to her to say that Amanda lied than to say that Patrick closed the bar.
I don't know how she went about establishing how Patrick went out and committed murder when the bar was open, but I will reread your article and look into it more later.