(EDIT: this was in 2022) center does ban for smurfing. two of my steams were perm banned for smurfing and i wasn't ban evading. the first smurf ban i received was after my first match ever played on that account. i queued for the chance to play in one of jerydash's matches. played the match, stopped jery's team (poor jery had noobs), and was perm banned for smurfing a few hours later. both those steams are 10+ years old with hours in cs, l4d2, and tf2, but hours and steamid's don't mean much these days. super easy to purchase steamid's with game hours. it's possible smurf bans without ban evasion is just a label used to ban suspected cheaters without evidence of software assistance. honestly we just need an anticheat client. just like when esea came out with their anticheat for cs1.6 and a decent percentage of *really good* players fell off as if they never touched the game.
great to see players that know how to have fun while they practice and play. it's a rare sight. also i laugh everytime i see that l4d2center message about no cheaters, ragequitters, or toxic players. ~80% of that player base are a combination of those three characteristics.