Ok, there are a couple of technicalities here. First, I want to be clear that I am not refrerencing a WikiTree policy, but rather a general standard you'll find in pretty much any field. As a general rule, you can't site yourself as a source. As a WikiTree mentor, I am frequently asked to address members who cite "First hand knowledge" as their only source for their pre-1700 ancestors. That's not okay.
As for your NEHGS publication (congratulations, by the way), I presume your article is well-sourced. In that case, you are not technically citing yourself, but are directing members to look somewhere else for your sources. I suppose that would be okay, especially since it is published in a respected journal and has presumably been somewhat vetted.
None-the-less, if you sourced a date of birth in your NEHGS article with a birth certificate, rather than cite your article as your source for the birthdate on WikiTree, I would argue it is better to again cite the original source, which is the original birth certificate.
Think of these simplistic scenarios:
David, how do you know that? Jillian told me. (Acceptable)
Jillaine, how do you know that? I told myself (Never acceptable)
Jillaine, how do you know that? Here's a link a book I'm selling. (Far from ideal)
Jillian, how do you know that? Here's a link to my sources published in a reputable journal (Ok, but perhaps still not ideal)
Jillian, how do you know that? Here's a link to the original birth certificate from which I abstracted my information? (Perfect)
Again, this is not set in stone rule and different entities will have their own standards as to what they deem acceptable.