"/Remake becomes available at 3:00 if a player is disconnected or flagged as inactive for 90 seconds. First blood against a player's team before they leave/dc will prevent a /remake vote."
"First blood against a player's team before they leave/dc will prevent a /remake vote."
"First blood... before... dc... prevent a /remake..."
"before... leave/dc..."
Broke it down for you. In your scenario you stated you got a first blood when they "had" an afk. That part was/is key. Had you gotten first blood when there was no afk flagged in the game then a remake would not be an option. But because someone was flagged as inactive or afk before first blood occurred it is still an option.