Where did the " meter man " story come from in the first place ?
A fictional work entitled "An Innocent Man" and it was also picked up by Lomax.
I pointed out long ago 2 things.
1) no one has produced this alleged witness statement. The claim is that a witness gave a statement but police never shared it with the defense thus the allegation is it was one of the documents turned over by police after the courts ordered release of more documents. So this is nothing more than an unsupported allegation.
2) Even if the claims were true it makes no difference because the claims simply were that Sheila was alone in the house so had the door locked (which alone is a suspicious claim), the meter man unlocked the door and walked in and surprised her and she shouted at this stranger she never met to get out and chased him to his car. Many people will chase strangers out of the house. This is not strange behavior attributable to having mental illness. It fails to demonstrate she was still having delusions despite being on her medication.
In the legal field we often engage in exercises saying even if we accept claims as true and view them in the light most favorable of the person making the claims what would be the implication. In this instance the implication is meaningless so it doesn't matter whether the claim is true or not.
If it was made up then some pro Jeremy person made it up to give the impression that right before the murders she was having delusions despite her medication.