I don’t think you’re reclaiming “peg”. Lost cause.

Everyone should be champion of some lost causes, not because their own have much chance to succeed, simply because otherwise they are all certain to never happen while in the first case, at scale, it’s almost guarantee that some will defeat the odds.

That said, "TFA" is ok, but "the TFA" seems even more extravagant than "PDF format"

PDF format is the same as EXE format or BMP format. They are named for the file extension. And the etymology of the file extension is treated as opaque.

I used the phrase “the TFA mummy” where the “the” is the article for “mummy.”

“The TFA mummy” has the same three articles as “the mummy in TFA” but one less word.

And pedantically, pedantry leaves the house when “TFA” walks in the door.

First of all, do as you please, really. Just be aware that on the other side it might feel surprising/awkward.

"The mummy in the fine article" is very aligned with the usual "preposition before article", while "the the fine article mummy" is apomediary¹ with its "article before article" structure.

¹ Distant from mean/median practices.

I was fairly aware of what I was doing. I was having fun writing for the part of HN that enjoys reading things like what I wrote.

Everything is not for everybody.

The more generous a person is regarding what they accept, the more things are for them.