Well, the article somewhat supports my claim if you read between the lines (remote the WeaselSpeak).
But on a somewhat more serious note, my view on this is:
I run a small company. We produce small-business electronic devices.
If you would give me the serial number of one product produced 15 years ago, it would take me less than 2 minutes to query our database of work reports, showing which employee had produced it on what date and time, using which components, coming from which delivery lot.
It would also be impossible that someone "forgot to put that in". You have to log in. You have to scan the device to be built. You have to scan the parts. You have to scan the finished product. There is automated QA. And there is manual inspection. Repair means - scan and go to step 1.
You can not delete records from this database, unless you are a system administrator, and if you are, there are offline backups.
And this is the minimum legal requirement in regards of product safety according to UL. For things that reside in homes on offices, not in the sky.
"The dog sadly has eaten our homework" should be technically and practically impossible. It can't be possible by a single entity to forget this, let alone possible for multiple different management layers departments (production, QA, Compliance Management, whatever) to all on this one day having had "bring your kid to work day", while all going out smoking pot while the kids are building the airplanes for that day :) - Either these work logs exist, or they have been intentionally (!) not produced, or they have intentionally be purged. There is no such thing as "can't find" in this regard.
To ground the planes may be good for aviation safety. But it also hurts the wrong people.
But what really needs to happen here is to someone go there, knock down the door, and ground the management until the work reports are produced, or management guilt be admitted.
It is shocking that the NTSB clearly does not have such powers, and that after more than two months of obvious stone-walling still have not been provided with any such powers. It should not even have come to the point of "If you won't provide the work reports, can we at least talk to the employees, pretty please?". They are supposed to be the regulatory authority.
Where is the A-Team when you need it?