This doesn't debunk anything until we know which security measures are in place in Pennsylvania, Atlanta, Arizona, Wisconsin, and Michigan. The article clearly says "Local election offices have security and detection measures in place that make it highly difficult to commit fraud through counterfeit ballots. While the specific measures vary, in accordance with state and local election laws and practices, ballot security measures can include signature matching, information checks, barcodes, watermarks, and precise paper weights. "
This doesn't debunk anything until we know which security measures are in place in Pennsylvania, Atlanta, Arizona, Wisconsin, and Michigan. The article clearly says "Local election offices have security and detection measures in place that make it highly difficult to commit fraud through counterfeit ballots. While the specific measures vary, in accordance with state and local election laws and practices, ballot security measures can include signature matching, information checks, barcodes, watermarks, and precise paper weights. "
No matter what security measures you have, it's completely useless if the fraudsters have a list of them ahead of time.
It would debunk that DHS would be involved with marking the ballots in some way before the states send them out.