There are two things I think might happen:
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They could be using some sort of “copyright” bypass method, most likely by uploading a slowed-down song that Audible Magic, which Roblox uses, has significant issues with (as do most audio fingerprint services). They then take this slowed-down audio asset and change the tempo to match the original. Does this mean they’re going to get banned instantly? No. For a game to be removed for copyright infringement, a copyright holder needs to manually submit a notification to Roblox.
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They might have obtained a license and cleared the audio asset. This is possible by emailing songclearance@roblox.com with the moderated asset ID and a license they may have paid for. Licenses for Roblox games typically cost between $15 and $300.