The (sede) priest at one of the chapels I assist at mentioned this indult last Sunday. 

Yep.  Happened at my chapel last Sunday as well [well, a year later].

It’s a product of misinformation spread by various groups. I don’t believe there was ever any malicious intent, just mistaken attribution.

I agree.  

With everyone still worked up, we forgot about the annual argument over abstinence on the Friday after Thanksgiving. Of all people, we should be the ones remembering traditions!

Another relevant thread: https://www.cathinfo.com/catholic-living-in-the-modern-world/thanksgiving-indult/msg857795/#msg857795

Bless me Father, for I have not sinned.  I took advantage of Pius XII’s turkey indult.  I’m on vacation in a beach cabin without refrigeration.  So I ate the turkey leftovers from the Thanksgiving restaurant meal on Thursday.
🦃 😋

The late Fr. Leonard Giardina, OSB, who was ordained in the 1940s, would say every year, "From TIME IMMEMORIAL, the Friday after Thanksgiving has NOT BEEN A DAY OF ABSTINENCE!  YOU MAY EAT MEAT!"

Indult or no indult, many, if not most bishops in the United States dispensed abstinence, and at this point, it has the force of custom.

I was bad this Thanksgiving.

Very bad.  For some reason I forgot it was Friday.. 
I hope to make it to confession. 

I feel like a hypocrite now.  Yikes.  I took advantage of the indult by accident.  I ate turkey scrapple at dienners.  Dinner we split a turkey hoagie.  I munched on turkey pepperoni. 

Maybe I can do major penance this advent.

You forgot it was Friday, so it was an”honest mistake,” regarding a venial matter,  subjectively not a sin at all.  Call it a weakness.  The fact that there was an optional indult has no bearing because you don’t normally observe it.  There’s no need to confess it.  Of course, extra penance is always good.  
In general, Catholics should follow the local custom when it comes to things such as the turkey indult.  If I were surrounded by Catholics who don’t celebrate American Thanksgiving, or, even if American, are not accustomed to using the turkey indult, and my doing so would cause scandal, then I’d not eat the turkey on Friday.  
If I were not accustomed to the turkey indult, but among people who do use it, I would eat the turkey on Friday if by abstaining, others would perceive m3cas a bad Catholic, or as a snob who has to demonstrate her piety by abstaining when others do not, then I’d eat the turkey.

For those whom insist it was for the entire Church, it is not.  Only Americans observe the holiday at this time!  America hardly comprises the entire Church!

I don't quite get it. There are loads of other national feasts in other countries. Is the Holy Mother Church supposed to give an indulgence to all of them? For example Canada has their thanksgiving as well