As far as I'm concerned they check smart contract code only. So its nice to see their audit ... you know that team can't manipulate circulating supply (for instance) or steal your money from liquidity pools (dex). But it does not protects token value (your investment) in case of rug-pulls or team simply disappearing (exit scams).

Top 20 CMC is quite safe and i would not go any further if you are not experienced enough.