Besides the post being completely speculative and very likely unrelated, I doubt this would be the basis of putting a partial hold, not a full hold, on an entirely unrelated company, with vaccines created but not limited necessarily by date.
I think if it related to a service provider, you'd hear about a halt on a service provider and how it impacted other companies, for instance... And there would be no real reason to keep that secret, because the service provider is the ultimately liable party, so you'd actually want people to know it wasn't due to anything you did... and more importantly, it would likely be health and safety related... there was no indication that that was the case for NWBO.
So, not sure why you're linking to that letter except on a wholly speculative basis.
I am not a medical related professional. I do have enough knowledge of the regulatory process to highly doubt this is connected in any way, given what we know otherwise. Is there any reason, other than the date of the letter, that you think makes this possibly relevant? And how are you drawing the connection to NWBO? What letter or date exactly is suggesting to you these are connected events? Your explanation was not very clear.