It could be that Delta Vega is naturally the "last stop" in the stellar arrangement before travelers would hit the barrier...
But travellers
in which direction???? The galaxy isn't a straight line. It's a huge, huge disk. And if the barrier surrounds its entire rim (in
three dimensions, mind, not just the edge of the disk but its faces as well), then "the last stop before hitting the barrier" is meaningless, because you'd hit the barrier in
any direction. Even if the barrier just extends across a certain percentage of the face of galactic disk (which is far more plausible than some kind of magic shrink wrap encasing the whole galaxy), it would still have to cover a vast surface area to qualify as a barrier at all, otherwise people could just go around it.
See, this is the problem with trying to draw arbitrary connections between different things seen in Trek episodes. It requires ignoring the fact that there should be a vast, expansive universe
beyond just what we've seen in Trek episodes. That everything the five televised starship crews have encountered in their journeys is just a tiny fraction of what the Federation as a whole has encountered or learned, and everything the Federation knows is just an infinitesimal fraction of what exists in our galaxy alone.
Besides, how often do enormous coincidences like that happen in your own life? Is every person you meet, every place you go to, directly connected in some way to a person or place you encountered 20 years ago in another city? No, of course not! Such coincidental connections crop up extremely rarely. Most of the people you meet, most of the places you go, have no cutesy, contrived connection to one another, even when they do have one or two superficial similarities. So why try to force such pointless interconnections onto a fictional world?