So even if you delete everything you see, if an old friend who disabled their account re-enables it, there's a fresh batch of content about you.
If Facebook refuses to do the deleting thing for an (actual) EU citizen because they claim their location tracking shows they aren't located within the EU, they are going to have a problem.
If, however, the EU citizen selects in their profile that they live in the US, and then FB refuses to delete their data, the courts are probably going to look favourably on them, cause the user explicitly said so.
Since FB most definitely is absolutely, unforgivably, NOT allowed to request or handle the nationality data in EU passports, for purposes of being a EU citizen, they're pretty much going to have to rely that you're whatever nationality you say that you are.
The UX is useless by design to make it really hard to bulk delete, the backend is shitty and you can't see your content on friend's walls that disabled their account.
It is bad to the point that you wonder if it is on purpose. My guess is that it is. "Shitty product" as a deterrent to deletion.
Try building a scalable database to billions of users on ad revenue and make it retrieve all data from years ago within the time constraints that users want to see newsfeed items in, you'll see ;)
I mostly used the Activity Log (button at the top of your profile page) to do the deletion. There are filters there so you can see the different types of interactions. Removing them is different, e.g. Delete vs Unlike.
During the process, I did notice things appearing which had previously not appeared, so that definitely does happen. I kept going back to see if there was new stuff to delete. The whole process took me about 3 months.
The plot twist is that this all happened over 6 months ago. My profile has been empty the whole time, until sometime within the past couple of weeks, where posts have started to re-appear.
While it did a better job, despite my activity feed being clear, I'm still seeing a lot of posts.
The rub is that I can delete posts that show up from 2008, but that same post will show up on refresh.
Looks like I'm moving to Europe for a day in a few months.