This sentence is a little ridiculous,
... although it is encouraged by reports of at least some customers receiving machines free of the issue.
Some customers have always been receiving machines free of issue. In fact the overwhelming majority of the new iMacs shipped have been free of the issue.
Yes it is an issue, and yes it probably effects a lot of customers. A rate of 0.1% is a lot of customers. This article finds a way to label the 99% "some."
you do realize what you just wrote is steaming with hypocrisy, right?