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. 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.
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.
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":