Reasons Why the Sample Could Be Disco:
a) she posted a video with disco in it a while ago (2017) .... she also did that with cherry blossom, and cherry blossom was eventually released. disco could be another one of her favorite tracks that she's made, and she's already shared it in one form, so it's possible she'll want to release it or sample it because she loves it
b) there's also the "made me feel like a god" line in white dress which is similar to "i am my only god", another (smaller, perhaps coincidental) callback to disco
d) lana posted on honeymoon with the caption "#IJustDon'tCareeeeeee" which is a line from disco (also the only line that she sung in the 2017 video... it could be her favorite line! if she samples a lyric or the melody it could be that one)
c) kaiman kazazian (who styled her!! and did the illustrations) posted part of an old video of lizzy singing disco (this one) to her story the same day lana made her "U can take ‘em out of the trailer park but…." post
e) she was going through old photos, posted a photo of her in a scarface sweatshirt, etc etc all around the same time as her trailer park girl post in september. these are all very ~lizzy grant~ activities and if she WAS filming something around that time and it WAS related to disco/the song she samples disco in... it makes sense that she'd revisit her lizzy days!
f) she posted the ASCAP news clipping from the lizzy show where she met ben, which is just a nice little memory, but she didn't post anything for BTD 10th anniversary so like i don't think she's good at remembering anniversaries unless they're on her mind and why was this one in particular on her mind? because she was revisiting old shows and lizzy things!!!!!!! to prepare for releasing a song that samples disco/releasing disco!!!
you may be saying, but honeybadger, there's no writers credited for disco! and to that i say lana could've very well written that song all by herself, just as she did with many of her laptop demos and songs around that time, and therefore doesn't need to credit anybody for the writing whether she's sampling lyrics, melody, etc. i don't think she would have to credit anybody besides herself
and now i am done.