It means that Hex and their suppliers are themselves not in contravention of the MSA, and that they promise they are diligent in screening for compliant labor practices.

For a SaaS, it's more or less just compliance-flavored magic words.

I used to make hardware products and it was very hard to sell in to bigger UK and Australian businesses until we could certify here.

When I see one of these in a contract, I mark it up to also include the 13th Amendment.