This is a subgenre of a subgenre of a subgenre! The larger subgenre is called Vaporwave and here's what has been said about it:
Vaporwave is a microgenre of electronic music and an Internet meme that emerged in the early 2010s.[16] The style is defined by its appropriation of 1980s and 1990s mood music styles such as smooth jazz, elevator music, R&B, and lounge music, typically sampling or manipulating tracks via chopped and screwed techniques and other effects.
https://en.wikipedia.org/wiki/Vaporwave
Starting as arguably the first internet-born music genre in 2010, Vaporwave attempted something that had never really been done in the realm of music: to create a nostalgia for something that never truly existed. With a focus on 80’s and 90’s consumerism and yuppie culture, cult electronic artists Daniel Lopatin (known as “Chuck Person” within Vaporwave) and James Ferraro created a new sound in music by creating songs reminiscent of old ringtones and manipulating old samples of songs long forgotten.
https://medium.com/@Thorcb/vaporwave-revisited-a-second-look-at-the-forever-mutating-genre-b7da26d76ca3
In more recent years, Vaporwave mutated into a more funky and danceable version based on heavily remixed old funk records called "Future Funk."
Your song is basically a subtype of this, but focused on more of a smoother, soul-based sound. There's no real name for it, but I had some success finding examples described as "Soul Vaporwave":