Wrong. The cell phone triangulation directly rebuts his claim of being at home that evening. It would be a circumstantial evidence thing if they were trying to establish something, such as "hey we are trying to prove you were here at X location", but it is a powerful piece of rebuttal evidence to a 15-year-long story as to where Jones was at the time the crime was committed (i.e., "you said you were at X location, but this evidence says that you were not, in fact, at that location").
As for the eyewitness testimony, sure. But, again, it is ALSO rebuttal of a long-standing "alibi" story. I don't think anyone has ever disputed the fact that there are no eyewitnesses to the actual crime itself. However, multiple pieces of evidence that contradict a 15-year old story about how he could not possibly have been at the scene of the crime? That is the type of stuff that can flip a jury to guilty. Not always, but it has been known to happen.
And I don't care if a lawyer can "paint reasonable doubt", the jury has to conclude that there is reasonable doubt. Some do, some don't. Lots of defense attorneys like to claim that they established reasonable doubt, but they don't unless the jury agrees. The jury, in and of itself, is very difficult to predict unless you've been in the courtroom during voir dire and the case itself, to evaluate and predict how the jury is reacting to certain evidence and arguments.
Non-lawyers often tend to make too much of words like "circumstantial" and "hearsay" and "reasonable doubt". Both circumstantial evidence and hearsay evidence are valid forms of evidence, and both have there inherent challenges and limitations. Plenty of people have been convicted based solely on circumstantial and/or hearsay evidence. This isn't Perry Mason, where a direct eyewitness appears at the last minute, or the "real killer" breaks down and confesses on the stand.