Nope, he's still a Commodore.
...I read that promotion post like
four times, and I could have
sworn Leslie was promoted to Rear Admiral at the same time he was sent off to take command of Ana Font. As of this time, however, his reassignment to the yard was listed in the 2313Q4 Rat Race post as a pure transfer.
As to what he's doing on Earth instead of around Tellar Prime, I don't know. I'm sure this thing happens to happen once in a while, and some quiet machinations would hardly be surprising given the extreme weirdness of this entire affair. Shipyard directors probably do go to Earth now and then, in order to report in on something or to answer questions for an investigation or something.
Truthfully, that's about as far as I think he'll get. I picture the Ana Font shipyard command as basically being his "until retirement" post.
Well, I kind of hope not since it's very hard for me to write good Leslie omakes with him in that post. As Chief of Warp Core Fabrication he had a reason to go places and see things and talk to people. Not so much, now.
That said, there's nothing about him that screams 'promote me!' and while it is
just possible that he'd make Rear Admiral... I don't think he has it in him to go higher than that, even within the specialized 'pipeline' of Shipyard Ops. More likely that he keeps getting kicked around laterally from office to office as the guy you throw at departments you need screwed back down after someone or something has screwed them up. For those times when you don't want a bright youngster in a job, you want someone who's got as much institutional experience in his head as the average Vulcan, and a spark of improvisational flair most Vulcans lack. The last disciple of Montgomery Scott, long after nearly everyone else who Knew Him When has retired or moved out of shipbuilding.
Another note: It would be genuinely hard for Leslie to resolve the contradictory paperwork tangle militating against his retirement. Not impossible, but difficult. Frankly, he loves his work too much to retire easily and he's gotten
very good at functioning despite physical disability. As long as his brains don't go to mush and his wife doesn't strongarm him into it... it'll be a
long time before he retires naturally.
If anything, a long enough stint at Ana Font may
trigger his retirement, not because he can't stand it, but because Susan Leslie gets tired of Tellarites. That would happen eventually, but it'd take a while.
Wait, did you retroactively promote Leslie?
The only effect of the time ripple that
I did on purpose was that Eddie's memories of time travel-related incidents have changed to reflect new information. When I wrote the omakes in question, he didn't remember any instances of time travel outside the ones that explicitly occurred in canon. Now, he remembers this one.