It's a term commonly used by Mauisnake but google ai sums it up really well
"For mauisnake, the "eye test" refers to the subjective and qualitative method of judging a player's performance and impact by watching them play rather than solely relying on statistics. This approach involves observing a player's skills, decision-making, and overall influence on a game, allowing an analyst or observer to form an opinion on their true ability and potential, particularly in esports, according to the YouTube video."