It turns out that Soulless Marauder did NOT make Back From The Past, it was someone named Newton TV. This was a fanmade music video that people mistook for being official, this music video was originally uploaded on 2nd March 2016 whilst Back From The Past was released in January 2016 or earlier, there were no other fnaf songs on Soulless Marauder's channel. I reckon the original upload from Newton TV did not have a music video, said original upload is still lost.

Thanks to Mysterika for sending me the archive of Soulless Marauder's channel which lead to me finding that the music video has been archived.

Also the thumbnail is the one used in Soulless Marauder's upload.