[2][3] The album features guest appearances from Lil Baby, Big Sean, Chris Brown, Adam Levine, EST Gee, Bryson Tiller, DaBaby, Tory Lanez and Lil Wayne, the latter three appear on the remix of Harlow's breakout single, "Whats Poppin".

[5] On the album, Harlow "pays homages to his Louisville roots while still affirming that his eyes are set on goals far beyond where he started.

Danny Schwartz of Rolling Stone wrote that Harlow "put Louisville rap on the national radar for the first time in a generation, and his music is strongest when he keeps it close to home."

Imogen Lawlor of Vinyl Chapters wrote that the album "shows incredible maturity, depth and understanding of his interactions with others", which is achieved through "playful production, immense musicality and blunt lyricism intelligently manipulated to profoundly articulate ambivalent sentiments about relationships and life more generally."

Thats What They All Say debuted at number five on the US Billboard 200, with 51,000 album-equivalent units (2,000 including pure album sales) in its first week.